Limiting grenades and rifle grenades is (at least) worth considering in my opinion. With server full of players game turns into a chaotic grenade fest full of random frags and deaths.
Anyway, I'm rather conservative when it comes to change gameplay and usually i vote to leave it as it is, because our server is so popular for a reason
and it means that ppl like to play here with present settings. Better is the enemy of good. So, if we plan to change something, we should do it carefully.