If they have a point system that includes assists, why not add a new tank point system where disabling a tank gives you points. Then make it so that people can only leave their tank when it's disabled.
That way when a tank is disabled both sides are happy; the tanker who disabled the other tank gets points for it, the survivor of the tank can try a daring escape (and he won't be stranded, waiting to be finished off some minutes later).
If they have it where you have to crawl from one point to another inside the tank, it'd be exciting if you've been hit, your tank is about to blow up, and you're desperately trying to make it from the driver's position to the commander's position so you can open the hatch and make a run for it