I think that there should be ramming and falling damage. Just saying, it would be fun to run over a newbie in your ultra-heavy tank.

Perhaps a flashbang is too infantry oriented? Remember, these are tanks we're talking about. Perhaps a smokescreen generator? Or smoke grenade launchers? I'd imagine a cloud of smoke concealing your movements would be pretty handy on open maps.

I think in general, it would be excellent etiquette to speak whatever language is dominant on a server. Though frankly, I don't know many bilinguals so, good luck with that.