Let me give my two cents worth:
$.01 Allow headquarter units the ability to coordinate multiple unit attacks for units under its influence. Also, allow the player to assign/reassign units to a headquarter unit.
$.02 Let the player set units' combat "posture." For example, attack (advance), engage (hold), hold (no retreat), withdraw (retreat before combat). The default would be "engage," for instance, as it is now in the game. Note that a unit in "attack" mode might be more susceptible to counterattack, etc.
Thanks for a great game, Hubert!