Here's a couple more suggestions:
1. Scouting stratagem: Eliminate the need to allocate elements to perform the scouting. Instead, purchasing and using the stratagem entitles you to a single roll. The problems at the moment are: (a) the stratagem is biased against armies with only a few eligible elements (especially if they're armies with Cv (S)); (b) the need to place surviving scouting elements with the C-in-C seems clumsy and unnecessary; and (c) for some armies the elements historically used as scouts can't be because they can't be in the C-in-C's command (a classic example is the Early Crusader, for whom the Byzantine allies were their scouts). This change simplifies and speeds up the process.
2. Betrayal stratagem: Eliminate it altogether. Has anyone ever used it? Or, as an alternative to eliminating it, change it to a stratagem which allows a player to increase the chance of an enemy's ally being unreliable to 1-3 on their first PIP dice (the cost of the stratagem representing the bags of gold delivered to said ally general).
3. BUA and BUAf: Eliminate the latter and simply allow all BUAs to be fortified with PF or TF. As it stands there are a number of very odd choices over whether an army can have BUA or BUAf - or even have a BUA at all - the lack of which effectively prevents some armies from using the Delay Battle stratagem.
4. Paved Road: Eliminate it. In how many battles did the existence of a paved road play a major role? Sure, they were significant strategically, but how often did they play a tactical role in a battle?
5. BUA and river: Is there any particular reason why BUAs can't be placed against a river? I'd suggest there are a significant number of cases where the site of a battle was near a town on a river. As it is there are some lists which have BUA and River in their terrain list, but not Road, which means the BUA can only be placed on one of the three non-enemy table edges.
6. Single element moves: The distinction for Expendables, train and Ships as opposed to other types of elements making single element moves should be eliminated. After all, the element represents a considerable number of chariots, wagons, ships or whatever within the area covered by the base, with a lot of empty space as well - that's plenty of space for the individual whatevers to make their moves. However, people think it's necessary to distinguish them, perhaps make such moves more expensive in PIPs.
7. Turning to face a flank hit: It'd be good to get some clarity about what happens when a group in line hits the flank of a group in column, particularly when the contacted elements are not 40 paces deep. For example, how do the attackers line up with the defenders, and which attackers do the defenders turn to face?
8. Kn wedges and Cv: The benefit for Kn wedges of not being overlapped doesn't come close to making up for the loss of the Quick Kill against Cv. For example, it makes it particularly hard for Alexander and Companions to deal with Darius and accompanying Cv in a realistic manner.
9. An index and more cross-referencing: Please! It's still so hard to find everything in the rules about all sorts of subjects. Even worse when Important Stuff isn't in the rules but in the list books (for example, the distinction between BUA and BUAf).