Regarding that spawn delay suggestion, I think the best way to do it is probably the way it is handled by TF2, and possibly other games. Spawns occur every 10 seconds (or some other arbitrary interval). When you die, you are put into the spawn wave AFTER the next one. In other words, you will wait a minimum of 10 seconds, but no more than 20. This prevents people from getting lucky and respawning instantly, and also guarantees that if you kill someone, they still stay dead for a while.

This is easy to make in jcs, but probably would be a good feature in jj2+. Dead people would be put into spectator mode.