jjf28 -- if you have a computer give them all to it; otherwise you can have on death counter keep track of which player is the first or last to run triggers and have conditions check "Current Player has suffered at least 1 deaths of leader"
FlameViper -- Yep... gonna have to switch everything to players 1-8, hopefully it won't repeat the triggers.
Oh_Man -- they can have death counts set for them though.... i think
Roy -- They can't run triggers. Only Players 1-8, Forces 1-4, and "All Players" can run triggers (the latter two just being groups for Players 1-8).
Excalibur -- No one past player 8 can run triggers IIRC.