I mentioned this during stream and you thought it had merit so just figured i would post it here to help it make your mod list.
In larger maps the unit panel can get very big making it a real pain. My favorite solution would be to allow drag and drop, but your ideas of some king of locical ordering would be an improvement over the current which is the order they were created. .. Heroes > most powerful > .. Only problem with that is you would like you scout(s) up front for quick ID and selection so maybe heroes, scouts, power...
Another point is that units stationed in cities are pretty much a who cares, these could/should be eliminated from the panel. You typically only have a few cities and so you can quickly click around to see/find units stationed there.
Question
Can - will you allow reordering or the army panel (see pix). It get very big an it would be nice to be able to place key armies at the top for quisk selection
http://screencast.com/t/kW51Xwr1ww