Offsets are a large problem. Game mechanics are a problem (making sure clear path from tip of barrel to hog, since barrel is just a graphic, and playing error sound if attempting to do a shot that fires through a girder for example).
But also the AI. Offsets complicate AI quite a bit.

Since a half-fix is much worse than current situation, probably will take a while.

Anything new on this topic?

Nope. No one stepping forward to solve the hard stuff so far. Are you volunteering?

Probably of all the hardest to solve, the AI is the most problematic.