Haveing a limit on FPS is not fair to all ingame players, as the ones that are further away from server have higher ping rates, we have to compensate with better equipment.
If u put a limit on FPS it is only fair, in my oppinion, you should put a cap on ping also, Otherwise this game is only for those who play next to server.
When Pk-ing it really is about how u move, when u have a 120 ping u are a sitting duck, regardless of kit.