Ok, let me see again.
> Engel and Geist are most likely to be killed
They have exterminators. It's not like they're going to die with normal bots.
Just don't forget powerful bots on Temple Wood. :)
...And if you do, I think that they may eventually respawn, not sure. Just
remember to remove (hack) the bad bots as wait the 10 minutes delay for respawn.

> Francis isn't much of a problem, because you get his quest first
I'm not sure about why you would forget powerful bots on cryo lab. Plus, melee
bots will be quickly destroyed by the 614. 
But, an advice! Don't leave bots there. Act 2 may use Francis again, although
I'm 97.6% sure that it's Spencer (or rebel leader, if you go w/ rebels) who will
give you next big quest.

> Kevin gives quests and teaches hacking
Don't break his wall, and he will be fine. He have a 614, a lawnmower and can
lock his gate, right? Plus, if you kill him, there is also Richard. :)

Hmm... I think that it's all.