While you have already done a very good job with the way reinforcements and reserves work, I think what some of us are missing is the ability to completely control these reserves ourselves. I'm sure you are starting to get bored with comparisons to the old SMG game, but one thing I feel they did very right, was letting the players be able to ''release'' reserves for a certain price. That way, we had to make decisions based on risks and rewards (Is releasing those reserves worth the potential reward? Can you afford to abandon their previous position? Etc.). IMO, the more freedom for the player, the better .
As for the size of the map... I know you guys have a lot on your plate already, but I think offering some options at some point in time would enrichen the experience, especially for players who do have the proper specs .