I'd like a doom playertype that acts like Doomguy from Doom 1. It be really cool for a deathmatch. It'll also only allow you to look sideways, and shoot up and down for you. You could also add bots that will most likely kill you if you stand still, by adding a powerfull weapon.
(Also, don't call the aiming an "aimbot." if you think it is a bad thing, simply say this playertype is a bad idea.)
second suggestion: You know like in some games where if you get hit by a bullet, this indicator shows up, pointing towards the place where you were hit. It would be cool if it was in blockland.