Micro-managing: In AB, a battalion sized march formation including platoons, srsections, and single vehicles of various types all moving at their own preferred speed degenerates into an undisciplined rabble within a km or two. The player is supposed to be a battalion or brigade commmander managing a battle, coordinating and directing the actions of his subordinates, not an MP sargeant directing traffic far behind the fight. That is something the AI should do. I have posted on this before. TacOps (here I go again) did that very well, all units moved at the same speed, easy. Rëference FM 100-2-1 "The column organization, established before starting the march, should minimize or preclude any reorganizing before commitment to battle."
Map size: On further consideration, the maximum AB map size, 15km x 15km, split between Friendly and Enemy forces, is just a bit too small to provide doctrinal separation between the CRP, FSE and battalion main body, except if the scenario starts with the CRP already in contact.
AI: Since the AI cannot be disciplined into deploying its forces in a March Formation: MRB Moving to FEBA, or equivalent US/NATO March Formation, then scenarios involving racing to block or intercept an MRB that has broken through cannot be modelled in AB.