Thanks for the linke and awesome, awesome work. I read through this twice and each time started a new save game because of what I learned.
Edit: You can also click on the 'status' screen (Backspace) minimap to tell groups to move around. You can't see an overhead view of the terrain tho, just your groups as colored blobs and them as red blobs but it does in theory and sorta in practice allow you to tell groups to move to a location out of line of sight. It takes some stabbing...
If you have enabled the 'continue battle after death' tweak, you can still command your troops through this screen as well. It is kinda guesswork as you have limited information available but its better than no command.
Although I'm well aware of the screen, I find that it is far too difficult to use effectively - basically you just can't be sure if you're telling your guys to stand half way up a cliff. The best use for it, as I see it is:
1) getting cavalry to flank when you're on foot.
2) getting units to run away if they're vulnerable, to a map edge.
A way to increase the usefulness, if you don't mind a bit of fiddling, is to remove all troops from the cavalry, infantry and archers groups, then set those groups to stand ground at given points you can recall (e.g. river bank, top of the hill etc). The flags will appear on the map and serve as a bit of a reference point for future movements. Unfortunately, it means you're going to have to remember where other troops are holding, as other groups don't get flags.
You can only set these flags by pressing and holding F1 if you don't have anyone in the group - clicking on the 'map' brought up by backspace will do no good. It's probably more fiddling than it's worth, but it does give some use to the overview.