[Mobhack]

1) Ground units do react - e.g. to a failed close assault. Tanks will beat up on infantry revealing themselves. Cant say I have seen helos popping off at random though.

2) Engineers have never dug in your troops or laid mines in these games. You are likely thinking about another game developed by different folks?.

2.1) The overwatch feature is sometimes useful if you only want to fire at say the exit from a town. Place the hex where the road exits, set the distance to a small circle, and then ensure you reduce the regular opfire distance for the overwatching unit!. The overwatched circle must be outside the main opfire range measured round the firer to be useful. Otherwise the primary opfire circle will naturally take precedence.