Recently they added overheating to repair tools, which helps a little bit when it comes to engineers not being able to repair in the middle of a battle, but with multiple engineers on task it's still possible to heal through incoming damage like you're playing WoW.
The difficulty in creating an Engineer class that is fun to play without being overpowered is that nobody wants to sit around and repair for hours when there is no combat going on, while at the same time it's really unfair if you can jump out of a tank and repair it in the middle of a fight.
I think I have a possible solution:
The heat of a repair tool is not caused by repairing, but by the thing you are repairing taking damage.
Basically you can repair infinitely just like before, however, when the thing you are trying to repair is getting shot at your tool starts heating up, and can potentially shut down. The shut down would last a little longer than it does currently, to make it more dangerous to keep repairing when your repair target is taking shots.
The advantage to this system is that it doesn't make repairing horribly boring when its happening out of combat, but it still makes repairing in combat a lot less effective, because when 3, 4 engineers are all on the same vehicle all their tools heat up when that vehicle is under fire, so you can't just put more engineers on a vehicle to keep it from blowing up.
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