If I have a map with computer, rescuable, and human players in the same force, will anything go awry? it is single player and I am already aware of the inability to (over battle.net) move between forces if there's a computer player in that force.

An artist's depiction of an Extended Unit Death
Outside of the lobby limitation you mention, not particularly. Pairing up humans and computers/neutrals/resuables in the same force doesn't cause any in-game concerns.
Force flags for alliance don't work as expected between humans and computers (computers treat the human as hostile even when the ally box is checked), so you would have to run a trigger to correct this behavior.
Computers in the same force as humans will not be allied to them. Computers in different forces as other computers will still be allied to them.
Post has been edited 2 time(s), last time on Aug 10 2015, 8:38 pm by Roy.
I already knew that, but thanks for the info nonetheless! Just wanted to rule out the possibility of it causing issues.