Welcome back! (A couple of answers assume you have the purchased version - as you intimate in your post):
1) The red bar at the top of the screen shows hex (and terrain) height and type.
From the manual:
2) Yes, Yes. (Personally I only ever fire 1/2 available shots from the halt if I want to assume some OpFire)
3) Just like your units AI (and other player) units can, sometimes (very occasionally), manage to rally from rout.
4) Yes. From the Misc Tab of the Game Options screen (before hitting "Play") adjust graphics delay and/or scroll speed.