feat: add IgnoreDefault optional interface

context.go

@@ -550,11 +550,16 @@ func (c *Context) trace(node *Node) (err error) { //nolint: gocyclo
 	return c.maybeSelectDefault(flags, node)
 }
 
+// IgnoreDefault can be implemented by flags that want to be applied before any default commands.
+type IgnoreDefault interface {
+	IgnoreDefault()
+}
+
 // End of the line, check for a default command, but only if we're not displaying help,
 // otherwise we'd only ever display the help for the default command.
 func (c *Context) maybeSelectDefault(flags []*Flag, node *Node) error {
 	for _, flag := range flags {
-		if flag.Name == "help" && flag.Set {
+		if _, ok := flag.Target.Interface().(IgnoreDefault); ok && flag.Set {
 			return nil
 		}
 	}

help.go

@@ -14,9 +14,11 @@ const (
 )
 
 // Help flag.
-type helpValue bool
+type helpFlag bool
 
-func (h helpValue) BeforeReset(ctx *Context) error {
+func (h helpFlag) IgnoreDefault() {}
+
+func (h helpFlag) BeforeReset(ctx *Context) error {
 	options := ctx.Kong.helpOptions
 	options.Summary = false
 	err := ctx.Kong.help(options, ctx)

kong.go

@@ -283,7 +283,7 @@ func (k *Kong) extraFlags() []*Flag {
 	if k.noDefaultHelp {
 		return nil
 	}
-	var helpTarget helpValue
+	var helpTarget helpFlag
 	value := reflect.ValueOf(&helpTarget).Elem()
 	helpFlag := &Flag{
 		Short: 'h',