Actually, it would probably be really easy to do community wise, all's you would need is a modified flaming skull relic, and some sort of football esque rules. Hard part would probably be the initial set up, but after that, you could make some rules about the line of scrimmage etc. It would be stupid but funny.
id prefer bigger maps in this game, also some rpg elements, dungeons would be cool. more meaningful map terrain, buildings, castles etc
Killing, Large increased HP pool. It would more be about hard ccing than killing (no dooM) (a relic that gave +50 hp in the corner for instance)
