Greg,
If you look for the OOB of the soviet army in former Czechoslovakia, you should look at:
http://63.99.108.76/forums/index.php?showtopic=20013
Aaron,
I've also noticed too many "empty space" behind the front line.
It's especially unreal while playing WP you can often "travel" freely through West Germany from town to town...
Perhaps the Heimatschutz companies fixed in some towns would be a good solution?
I think these units could be fixed, they were not intended for moving from their hometown. They had to prepare defence of their town and wait for attackers.
Such fixed units couldn't complicate the game, they were weak, but at least would force fast advancing soviet units to pass by some towns.
Their list is on the tanknet's NATO OOB.
In bigger East Germany towns the same role could play "worker class" units.
Michal