I DID IT HOLY SHIT I GONE AND DONE IT

OnSecondaryUse is what throwing uses for doing things SPECIFICALLY on throw. This way, you can theoretically have grenades on which you'll have to pull the pin before throwing.
This also lets flares be used without the need to throw them.
did i mention my brain hurts

Barotrauma/BarotraumaShared/Source/Items/Components/Machines/Controller.cs

@@ -165,15 +165,15 @@ namespace Barotrauma.Items.Components
             if (this.character == null || this.character != character || this.character.SelectedConstruction != item || !character.CanInteractWith(item))
             {
                 character = null;
-                return;
+                return false;
             }
-            if (character == null) return;     
+            if (character == null) return false;     
 
             Entity focusTarget = GetFocusTarget();
             if (focusTarget == null)
             {
                 item.SendSignal(0, XMLExtensions.Vector2ToString(character.CursorWorldPosition), "position_out", character);
-                return;
+                return false;
             }
             
             character.ViewTarget = focusTarget;
@@ -191,6 +191,8 @@ namespace Barotrauma.Items.Components
             {
                 item.SendSignal(0, XMLExtensions.Vector2ToString(character.CursorWorldPosition), "position_out", character);
             }
+
+            return true;
         }
 
         private Item GetFocusTarget()