I understand the difficulties of AI path finding and obstacle avoidance for GV missions. However, I think a minimal amount of support could be provided much simpler.
If the Mission Editor could have a toggle to display trees like the TE does, then the mission designer could map out a static route that avoids obstacles. The AI would only operate the shooting at any near by enemy. The AI however would always follow the pre-defined path. (Note: there is a toggle for view "terrain detail" in the MisEd. Not sure what it does, but it doesn't make trees visible.)
The GV route could have segments like cruise , patrol, attack, that mirror similar segments for aircraft in controlling how aggressive they are a engaging enemy targets (GV or AC).
Naval vessels could piggyback off the same capability.
This would open up a lot of possibilities for Naval/GV/AC missions.

,
CptTrips