Vehicle recovery

[low_bidder]

I think he means a hex that not only has a M-kill chance but a +1 movement modifier. Sand on a slope, or rough on a slope. Snow drifts with trees, mud with trees. I think shell holes in sand dunes also, although that is pretty rare.
I can't remember right now if burning woods has a +1 MP modifier.
IMHO the worst is a rough slope with trees. Turn tanks into pillboxes with one click of the mouse.
It's not just terrain, unit experience is a factor.
For in battle recovery, the type of M-kill would have to be determined by the program and stored in a field. Otherwise a tank with the idler blown off and the track spread out over the ground would be treated the same as a jeep with a flat tire. That would not be an improvement, in my opinion.
I don't think there is anything wrong with it the way it is now. Then again, I always move 1 hex at a time unless I'm moving units from on side of the battlefield to the other, behind my lines.