Idea for base defenses

Maybe this is a stupid idea, and i'm not sure if it's been suggested, but I'd like to think it has some merit.

I was just thinking how cool it would be if players were able to adjust their defenses' favourite targets. Obviously Hidden Teslas prioritise P.E.K.K.As, but would it be a popular idea to allow everyone to be able to choose what enemy troops each of their defenses target? (for example, adjust cannons to prioritise goblins etc). Such an idea probably adds a bit of unpredictability to a raid, whilst also handing a bit more control to players over their bases in general.

Only issue is that it might upset the balance and sway a little too much control to the defensive player. Meat-shields such as Giants and barbarians would be rendered a bit more useless.

Anyway, thoughts?