(Possibly) tricky dromed questions - please help!!

[THEthief]

Ok, I had a brilliant ( ) idea, which I can't reveal yet, 'cause 'That would be telling'. Ahem. Anyways, I need to know if
#1. the objective "kill all humans (or whatever creatures I set it to) would fail, if they're all dead, just not by Garrett's hand (for instance, if a spider kills a human, but GARRETT didn't kill them human, would the mission fail? Be incomplete?)
#2. its possible to make things spawn at a particular time, because of a certain action - for instance, if Garrett's health goes below a certain point, can I make a health potion spawn somewhere? (I know this is probably a really outrageous expectation for the dark engine, but it would be great if it was possible (possible, I mean, without doing a TON of work)). If that's not possible, would it be possible to make something spawn 'x amount of seconds after an identical item is taken from that place'? (Again, probably outrageous, but... :-D)
#3. If it's possible to make things spawn a certain amount of time after the game starts?

Please let me know - just remember, if you don't help me, you are preventing the creation of one the greatest masterpeices in history.

Seriously, though, please help me!!