diff --git a/contrib/scoverage/src/ScoverageReport.scala b/contrib/scoverage/src/ScoverageReport.scala
index fb85ec88cd1..c852c915368 100644
--- a/contrib/scoverage/src/ScoverageReport.scala
+++ b/contrib/scoverage/src/ScoverageReport.scala
@@ -4,6 +4,7 @@ import mill.contrib.scoverage.api.ScoverageReportWorkerApi.ReportType
 import mill.define.{Command, Module, Task}
 import mill.eval.Evaluator
 import mill.main.RunScript
+import mill.util.SelectMode
 import mill.{PathRef, T}
 import os.Path
 
@@ -84,7 +85,7 @@ trait ScoverageReport extends Module {
       mill.main.ResolveTasks,
       evaluator,
       Seq(sources),
-      multiSelect = false
+      SelectMode.Single
     ) match {
       case Left(err) => throw new Exception(err)
       case Right(tasks) => tasks.asInstanceOf[Seq[Task[Seq[PathRef]]]]
@@ -93,7 +94,7 @@ trait ScoverageReport extends Module {
       mill.main.ResolveTasks,
       evaluator,
       Seq(dataTargets),
-      multiSelect = false
+      SelectMode.Single
     ) match {
       case Left(err) => throw new Exception(err)
       case Right(tasks) => tasks.asInstanceOf[Seq[Task[PathRef]]]
diff --git a/main/src/mill/main/MainModule.scala b/main/src/mill/main/MainModule.scala
index 59671f6bb03..e907f0b69ea 100644
--- a/main/src/mill/main/MainModule.scala
+++ b/main/src/mill/main/MainModule.scala
@@ -6,27 +6,51 @@ import mill.T
 import mill.api.{Ctx, PathRef, Result}
 import mill.define.{Command, NamedTask, Task}
 import mill.eval.Evaluator
-import mill.util.{PrintLogger, Watched}
+import mill.util.SelectMode.Multi
+import mill.util.{PrintLogger, SelectMode, Watched}
 import os.Path
 import pprint.{Renderer, Truncated}
 
 object MainModule {
+  @deprecated(
+    "use resolveTasks(Evaluator, Seq[String], SelectMode) instead",
+    "mill after 0.10.0-M3"
+  )
   def resolveTasks[T](
       evaluator: Evaluator,
       targets: Seq[String],
       multiSelect: Boolean
-  )(f: List[NamedTask[Any]] => T) = {
-    RunScript.resolveTasks(mill.main.ResolveTasks, evaluator, targets, multiSelect) match {
+  )(f: List[NamedTask[Any]] => T): Result[T] =
+    resolveTasks(evaluator, targets, if (multiSelect) SelectMode.Multi else SelectMode.Single)(f)
+
+  def resolveTasks[T](
+      evaluator: Evaluator,
+      targets: Seq[String],
+      selectMode: SelectMode
+  )(f: List[NamedTask[Any]] => T): Result[T] = {
+    RunScript.resolveTasks(mill.main.ResolveTasks, evaluator, targets, selectMode) match {
       case Left(err) => Result.Failure(err)
       case Right(tasks) => Result.Success(f(tasks))
     }
   }
+
+  @deprecated(
+    "use evaluateTasks(Evaluator, Seq[String], SelectMode) instead",
+    "mill after 0.10.0-M3"
+  )
   def evaluateTasks[T](
       evaluator: Evaluator,
       targets: Seq[String],
       multiSelect: Boolean
-  )(f: Seq[(Any, Option[ujson.Value])] => T) = {
-    RunScript.evaluateTasks(evaluator, targets, multiSelect) match {
+  )(f: Seq[(Any, Option[ujson.Value])] => T): Result[Watched[Unit]] =
+    evaluateTasks(evaluator, targets, if (multiSelect) SelectMode.Multi else SelectMode.Single)(f)
+
+  def evaluateTasks[T](
+      evaluator: Evaluator,
+      targets: Seq[String],
+      selectMode: SelectMode
+  )(f: Seq[(Any, Option[ujson.Value])] => T): Result[Watched[Unit]] = {
+    RunScript.evaluateTasks(evaluator, targets, selectMode) match {
       case Left(err) => Result.Failure(err)
       case Right((watched, Left(err))) => Result.Failure(err, Some(Watched((), watched)))
       case Right((watched, Right(res))) =>
@@ -61,7 +85,7 @@ trait MainModule extends mill.Module {
       mill.main.ResolveMetadata,
       evaluator,
       targets,
-      multiSelect = true
+      SelectMode.Multi
     )
 
     resolved match {
@@ -91,7 +115,7 @@ trait MainModule extends mill.Module {
       mill.main.ResolveTasks,
       evaluator,
       targets,
-      multiSelect = true
+      SelectMode.Multi
     ) match {
       case Left(err) => Left(err)
       case Right(rs) =>
@@ -111,7 +135,7 @@ trait MainModule extends mill.Module {
       mill.main.ResolveTasks,
       evaluator,
       List(src, dest),
-      multiSelect = true
+      SelectMode.Multi
     )
 
     resolved match {
@@ -151,7 +175,7 @@ trait MainModule extends mill.Module {
    * Displays metadata about the given task without actually running it.
    */
   def inspect(evaluator: Evaluator, targets: String*): Command[String] = mill.T.command {
-    MainModule.resolveTasks(evaluator, targets, multiSelect = true) { tasks =>
+    MainModule.resolveTasks(evaluator, targets, SelectMode.Multi) { tasks =>
       val output = new StringBuilder
       for {
         task <- tasks
@@ -184,7 +208,7 @@ trait MainModule extends mill.Module {
         if (evaluator.effectiveThreadCount > 1) evaluator.copy(threadCount = Some(1))
         else evaluator,
       targets = targets,
-      multiSelect = true
+      SelectMode.Multi
     ) { res =>
       res.flatMap(_._2)
     }
@@ -197,7 +221,7 @@ trait MainModule extends mill.Module {
     MainModule.evaluateTasks(
       evaluator = evaluator,
       targets = targets,
-      multiSelect = true
+      SelectMode.Multi
     ) { res =>
       res.flatMap(_._2)
     }
@@ -219,7 +243,7 @@ trait MainModule extends mill.Module {
         }
       ),
       targets,
-      multiSelect = false
+      SelectMode.Separated
     ) { res =>
       for (json <- res.flatMap(_._2)) {
         T.log.outputStream.println(json.render(indent = 4))
@@ -255,7 +279,7 @@ trait MainModule extends mill.Module {
           mill.main.ResolveSegments,
           evaluator,
           targets,
-          multiSelect = true
+          SelectMode.Multi
         ).map(
           _.map { segments =>
             Evaluator.resolveDestPaths(rootDir, segments).out
@@ -328,7 +352,7 @@ trait MainModule extends mill.Module {
       mill.main.ResolveTasks,
       evaluator,
       targets,
-      multiSelect = true
+      SelectMode.Multi
     ) match {
       case Left(err) => Result.Failure(err)
       case Right(rs) => planTasks match {
diff --git a/main/src/mill/main/MainScopts.scala b/main/src/mill/main/MainScopts.scala
index 6a017bed045..7d83331b6f8 100644
--- a/main/src/mill/main/MainScopts.scala
+++ b/main/src/mill/main/MainScopts.scala
@@ -1,6 +1,7 @@
 package mill.main
 
 import mill.eval.Evaluator
+import mill.util.SelectMode
 
 case class Tasks[T](value: Seq[mill.define.NamedTask[T]])
 
@@ -14,7 +15,7 @@ object Tasks {
             mill.main.ResolveTasks,
             Evaluator.currentEvaluator.get,
             s,
-            multiSelect = false
+            SelectMode.Single
           ).map(x => Tasks(x.asInstanceOf[Seq[mill.define.NamedTask[T]]])),
         alwaysRepeatable = false,
         allowEmpty = false