Choice of spawn in duel
Idea: after the initial random spawn in a duel match, players get to choose their spawn location after each death. The purpose of this would be to reduce unnecessary randomness, decrease spawnfrags, and maybe increase frags from spawn. From a gameplay perspective, it would create a bit of comeback power and remove a large source of unneeded variance in matches. I think fun situations arise more often when you can actively decide to spawn in front of a low-health opponent and rush him with a shotgun+laser.
Also, this would resolve the complaints about the spawn system :)