So I'm trying to make a skirmish mode that uses my RGA faction as the attacking force. The problem is that the actors don't realize the strength of the jetpacks they're using and just fly straight up a lot of the time.

I was wondering if there's a way to make the actors use the jetpacks properly.

You could try having your skirmish use actors with weaker jet packs so they dont fly straight up
AddActor = AHuman
CopyOf = RGA guy
PresetName = RGA guy2
Then have the jet pack have 1/2 fuel?

Or is the problem bigger than them just flying straight up?

I guess that would work :p

The only other option I see is to modify the AI to make it think the jetpack is less powerful. You would have to modify how long it tries to use the jetpack when it jumps.