[Mobhack]

1) "cover"? - what is that? - there is no such game status. There is dug-in, and that is already shown.

2) Is irrelevant

3) Just like in real life, examining a map gives you a hint of LOS from a spot, but actually going there needs to be done to find out the true LOS at that point. (SP maps are perfect, and show all fords etc, already)

4) In the game if a crew separates, then it is the active unit. Destroying the crew destroys the abandoned unit (at end of game).
Exception - if you occupy the same hex as an abandoned unit, you destroy it.