Heimerdinger is too easy for 1. Turret abuse 2. No control over his turrets. Here's some ideas

So heim obviously doesn't take much skill, considering his turrets do all the farming, all the damage, and overall pushing. And the fact that heim is able to abuse this mechanic with 3 turrets out makes him seem a little TOO good. So me and my friends had 2 ideas on nerfing him.

1- Controlling his turrets: Now I'm not saying they will be completely changed, but this will make it to wear his turrets have to be controlled. They will not fire until you you control them, by holding down the ability, instead of tapping it. Also, when controlling his turrets, he will have to stand still, and be vulnerable. This way instead of just walking around lane aimlessly, he actually will have to be doing something. This doesn't make his have less turret abuse, but at least it stops him from being too easy to play.

2- Turret shots cost mana: The second and last idea is that heim's turrets cost 5 mana per shot. This way, heim no longer can abuse his turret mechanic, and if he does, he will be punished for doing so, and losing a lot of mana on the way. This also means no easy farm, no staying in a turret triangle, and no more easy damage. I feel like this makes heim wayyy less annoying, and im sure he will be played in a whole different way.