@Imperious:
no and artillery should not boost infantry. Fighters should boost tanks. heavy Artillery rolling a one in the first round choose loses and all artillery should move 2 spaces
The basic rule could say that units dont modify each other.
Then we could have this Leader/Commander/General/HQ unit, and with this mastermind present Combined Arms would be allowed, like artillery boost infantry, and fighters boost tanks. I suggest that a task force with an General can roll all dices simultanesly, and then assign the results to the units. This is because this General make better use of the resources (the dice), than a stack with no brain.
Example 1; A Task Force with 1 General, 2 tanks, 3 artillery and 8 infantry attack an enemy stack.
This is 14 dice that are rolled simultanesly. (The General also contribute with a die, that are without any fixed value.) Assign all 1’s to the infantry, all 2’s or less to the artillery, all 3’s or less to the tanks.
Example 2; A stack without any General, but with 2 tanks rolling separatately, 3 artillery rolling separately and 8 infantry rolling separately. This is the basic combat system present.
So now we need a Leader unit. Luckily it seem like TT already made this molds :-)