You cannot ban by MAC. Do not even think about it! It can't be done, and even if it could be done, it wouldn't work anyway.
What's MAC stand for?
Media Access Control, it's a hardware address that's meant to be unique to every networking device (a NIC, a router, a DSL modem, etc...). So theorteically ban-by-MAC should block a user until they grab a new peice of hardware.
But.... MACs are readily spoofable in all OSs so ban-by-mac is utterly useless unless the greifer being banned is the n00best of the n00bs.
Anyway, ideas for v1.2, aside from bugfixen and any balance issues:
1. Alien choppers (as in HUD claw models, not helicopters or penises)
2. Weapon reload animations.
3. Damage given/taken on scoreboard including buildings.
4. Class/species specific gibs and blood decals.
5. Ponies!!1!.
My £0.02 is in the pot...