I agree nades should be limited.
Imo, the best solution to limit nade spam was in the map Jucha back in the mod. Only the riflemen spawned with 2 nades each and the others get nothing. Since the bolters tend to get outgunned by the SMGs, semi-autos, and MGs, giving them the nades makes sense. There's a reason why Jucha is considered one of the best RO maps ever. Without the unrealistic nade spam the flow and gameplay of the map was just beautiful. I think it would be an excellent (but by no means the only) solution. I'd be interested in what others think of this...