I downloaded this and your assist based selection mod, they're very handy. Before I found these I posted this suggestion on the forums.
viewtopic.php?f=42&t=9742
Basically, players could box select different kinds of units e.g. direct- and indirect-fire units to allow for easier micro and more interesting unit mixes. You won't often see a large group of hoplites and rhinos, for example, because of micro problems. I know this is outside the scope of this mod but I just thought I'd bring it to your attention. Thanks for the mods.