diff --git a/main/src/main/scala/sbt/Cross.scala b/main/src/main/scala/sbt/Cross.scala
index 2bdde84dd..21902e4d4 100644
--- a/main/src/main/scala/sbt/Cross.scala
+++ b/main/src/main/scala/sbt/Cross.scala
@@ -54,12 +54,17 @@ object Cross {
         }
       }
       val spacedVersion = if (spacePresent) version else version & spacedFirst(SwitchCommand)
-      val verbose = Parser.opt(token(Space ~> "-v"))
+      val verboseOpt = Parser.opt(token(Space ~> "-v"))
       val optionalCommand = Parser.opt(token(Space ~> matched(state.combinedParser)))
-      (spacedVersion ~ verbose ~ optionalCommand).map {
+      val switch1 = (token(Space ~> "-v") ~> (Space ~> version) ~ optionalCommand) map {
+        case v ~ command =>
+          Switch(v, true, command)
+      }
+      val switch2 = (spacedVersion ~ verboseOpt ~ optionalCommand) map {
         case v ~ verbose ~ command =>
           Switch(v, verbose.isDefined, command)
       }
+      switch1 | switch2
     }
 
     token(SwitchCommand ~> OptSpace) flatMap { sp =>
@@ -195,11 +200,11 @@ object Cross {
         commandsByVersion.flatMap {
           case (v, commands) =>
             commands match {
-              case Seq(c) => Seq(s"$SwitchCommand $verbose $v! $c")
+              case Seq(c) => Seq(s"$SwitchCommand $verbose $v $c")
               case Seq()  => Nil // should be unreachable
               case multi if fullArgs.isEmpty =>
-                Seq(s"$SwitchCommand $verbose $v! all ${multi.mkString(" ")}")
-              case multi => Seq(s"$SwitchCommand $verbose $v!") ++ multi
+                Seq(s"$SwitchCommand $verbose $v all ${multi.mkString(" ")}")
+              case multi => Seq(s"$SwitchCommand $verbose $v") ++ multi
             }
         }
     }
@@ -242,15 +247,18 @@ object Cross {
       if (args.version.force) {
         // The Scala version was forced on the whole build, run as is
         args.command
-      } else {
+      } else
         args.command.map { rawCmd =>
-          val (aggs, aggCommand) = parseSlashCommand(Project.extract(state))(rawCmd)
-          aggs
-            .intersect(affectedRefs)
-            .map({ case ProjectRef(_, proj) => s"$proj/$aggCommand" })
-            .mkString("all ", " ", "")
+          // for now, treat `all` command specially
+          if (rawCmd.startsWith("all ")) rawCmd
+          else {
+            val (aggs, aggCommand) = parseSlashCommand(Project.extract(state))(rawCmd)
+            aggs
+              .intersect(affectedRefs)
+              .map({ case ProjectRef(_, proj) => s"$proj/$aggCommand" })
+              .mkString("all ", " ", "")
+          }
         }
-      }
 
     strictCmd.toList ::: switchedState
   }
diff --git a/sbt/src/sbt-test/actions/cross-advanced/build.sbt b/sbt/src/sbt-test/actions/cross-advanced/build.sbt
new file mode 100644
index 000000000..ae2d20ef1
--- /dev/null
+++ b/sbt/src/sbt-test/actions/cross-advanced/build.sbt
@@ -0,0 +1,59 @@
+lazy val check = taskKey[Unit]("")
+lazy val compile2 = taskKey[Unit]("")
+
+lazy val root = (project in file("."))
+  .aggregate(foo, bar, client)
+  .settings(
+    crossScalaVersions := Nil,
+    addCommandAlias("build", "compile2"),
+  )
+
+lazy val foo = project
+  .settings(
+    crossScalaVersions := Seq("2.12.11", "2.13.1"),
+    libraryDependencies += "org.scalatest" %% "scalatest" % "3.1.0",
+
+    check := {
+      // This tests that +check will respect bar's crossScalaVersions and not switch
+      val x = (LocalProject("bar") / scalaVersion).value
+      assert(x == "2.12.11", s"$x == 2.12.11")
+      (Compile / compile).value
+    },
+    (Test / testOnly) := {
+      // This tests that +testOnly will respect bar's crossScalaVersions and not switch
+      val x = (LocalProject("bar") / scalaVersion).value
+      assert(x == "2.12.11", s"$x == 2.12.11")
+      val _ = (Test / testOnly).evaluated
+    },
+    compile2 := {
+      // This tests that +build will ignore bar's crossScalaVersions and use root's like sbt 0.13
+      val x = (LocalProject("bar") / scalaVersion).value
+      assert(x == scalaVersion.value, s"$x == ${scalaVersion.value}")
+      (Compile / compile).value
+    },
+  )
+
+lazy val bar = project
+  .settings(
+    crossScalaVersions := Seq("2.12.11"),
+    check := (Compile / compile).value,
+    compile2 := (Compile / compile).value,
+  )
+
+lazy val baz = project
+  .settings(
+    crossScalaVersions := Seq("2.13.1"),
+    check := {
+      // This tests that +baz/check will respect bar's crossScalaVersions and not switch
+      val x = (LocalProject("bar") / scalaVersion).value
+      assert(x == "2.12.11", s"$x == 2.12.11")
+      (Compile / compile).value
+    },
+  )
+
+lazy val client = project
+  .settings(
+    crossScalaVersions := Seq("2.12.11", "2.13.1"),
+    check := (Compile / compile).value,
+    compile2 := (Compile / compile).value,
+  )
diff --git a/sbt/src/sbt-test/actions/cross-test-only/foo/src/test/scala/foo/FooSpec.scala b/sbt/src/sbt-test/actions/cross-advanced/foo/src/test/scala/foo/FooSpec.scala
similarity index 100%
rename from sbt/src/sbt-test/actions/cross-test-only/foo/src/test/scala/foo/FooSpec.scala
rename to sbt/src/sbt-test/actions/cross-advanced/foo/src/test/scala/foo/FooSpec.scala
diff --git a/sbt/src/sbt-test/actions/cross-advanced/test b/sbt/src/sbt-test/actions/cross-advanced/test
new file mode 100644
index 000000000..96d9ad0f7
--- /dev/null
+++ b/sbt/src/sbt-test/actions/cross-advanced/test
@@ -0,0 +1,27 @@
+> + clean
+
+## verbose
+> + -v compile
+
+## test scoped task
+## this should not force any Scala version changes to other subprojects
+> + baz/check
+
+## test input task
+> + foo / testOnly foo.FooSpec
+> + testOnly foo.FooSpec
+
+## test + with task in multi-project with different Scala versions
+> + check
+
+## test + with command or alias
+> clean
+## for command cross building you do need crossScalaVerions on root
+> set root/crossScalaVersions := Seq("2.12.11", "2.13.1")
+> + build
+$ exists foo/target/scala-2.12
+$ exists foo/target/scala-2.13
+$ exists bar/target/scala-2.12
+$ exists bar/target/scala-2.13
+$ exists client/target/scala-2.12
+$ exists client/target/scala-2.13
diff --git a/sbt/src/sbt-test/actions/cross-test-only/build.sbt b/sbt/src/sbt-test/actions/cross-test-only/build.sbt
deleted file mode 100644
index c6f6e6e89..000000000
--- a/sbt/src/sbt-test/actions/cross-test-only/build.sbt
+++ /dev/null
@@ -1,16 +0,0 @@
-lazy val root = (project in file("."))
-  .aggregate(foo, client)
-  .settings(
-    crossScalaVersions := Nil
-  )
-
-lazy val foo = project
-  .settings(
-    crossScalaVersions := Seq("2.12.11", "2.13.1"),
-    libraryDependencies += "org.scalatest" %% "scalatest" % "3.1.0",
-  )
-
-lazy val client = project
-  .settings(
-    crossScalaVersions := Seq("2.12.11", "2.13.1"),
-  )
diff --git a/sbt/src/sbt-test/actions/cross-test-only/test b/sbt/src/sbt-test/actions/cross-test-only/test
deleted file mode 100644
index fa3b4e0a4..000000000
--- a/sbt/src/sbt-test/actions/cross-test-only/test
+++ /dev/null
@@ -1,5 +0,0 @@
-> + clean
-
-> + foo / testOnly foo.FooSpec
-
-> + testOnly foo.FooSpec
diff --git a/sbt/src/sbt-test/actions/cross/build.sbt b/sbt/src/sbt-test/actions/cross/build.sbt
index 6d1b52a23..02bce3223 100644
--- a/sbt/src/sbt-test/actions/cross/build.sbt
+++ b/sbt/src/sbt-test/actions/cross/build.sbt
@@ -1,20 +1,24 @@
-scalaVersion in ThisBuild := "2.7.7"
+ThisBuild / scalaVersion := "2.11.12"
 
-scalaVersion := "2.9.1"
+lazy val root = (project in file("."))
+  .settings(
+    scalaVersion := "2.12.11",
 
-scalaVersion in update := {
-  scalaVersion.value match {
-    case "2.9.1" => "2.9.0-1"
-    case "2.8.2" => "2.8.1"
-    case x => x
-  }
-}
+    update / scalaVersion := {
+      scalaVersion.value match {
+        case "2.12.11" => "2.12.10"
+        case "2.11.12" => "2.11.11"
+        case x         => x
+      }
+    },
 
-InputKey[Unit]("check") := {
-  val args = Def.spaceDelimited().parsed
-  def check(label: String, i: Int, actual: String) =
-    assert(args(i) == actual, s"Expected $label='${args(i)}' got '$actual'")
-  check("scalaVersion in ThisBuild", 0, scalaVersion in ThisBuild value)
-  check("scalaVersion", 1, scalaVersion.value)
-  check("scalaVersion in update", 2, scalaVersion in update value)
-}
+    InputKey[Unit]("check") := {
+      val args = Def.spaceDelimited().parsed
+      def checkV(label: String, i: Int, actual: String) =
+        assert(args(i) == actual, s"Expected $label='${args(i)}' got '$actual'")
+
+      checkV("ThisBuild / scalaVersion", 0, (ThisBuild / scalaVersion).value)
+      checkV("scalaVersion", 1, scalaVersion.value)
+      checkV("update / scalaVersion", 2, (update / scalaVersion).value)
+    }
+  )
diff --git a/sbt/src/sbt-test/actions/cross/test b/sbt/src/sbt-test/actions/cross/test
index 0ea962b97..974f3fdc2 100644
--- a/sbt/src/sbt-test/actions/cross/test
+++ b/sbt/src/sbt-test/actions/cross/test
@@ -1,8 +1,11 @@
-> check 2.7.7 2.9.1 2.9.0-1
-> ++ 2.8.2!
-> check 2.8.2 2.8.2 2.8.1
-> ++ 2.10.4!
+> check 2.11.12 2.12.11 2.12.10
+
+> ++ 2.11.12!
+> check 2.11.12 2.11.12 2.11.11
+
+> ++ 2.13.1!
 > set resolvers ++= Nil
-> check 2.10.4 2.10.4 2.10.4
+> check 2.13.1 2.13.1 2.13.1
+
 > session clear-all
-> check 2.7.7 2.9.1 2.9.0-1
\ No newline at end of file
+> check 2.11.12 2.12.11 2.12.10