Besides the well-known alliance problem i would suggest when double clicking a selected unit to select all units of that kind on screen. It's one of RTS's way to lend a hand when crowd-controlling.
This run after 8.2 version

Double clic = all same untis on screen
Triple clic = all units on screen
LE: Played a little more and these are the thing I got:
- When conquering an outpost you should reset the waypoint for production... I once had a load of tanks comming in my base just because one of my outposts got captured and the guy forgot to reset the waypoint.
- When group sellecting please add the deselect function (i sometimes select wrong and have to start it over again)
- When cursor over minimap commands don't work (try messaging or ally messaging someone when you forgot the cursor on the map)
- F4 (the stats) are not in the help menu (F1) - i just bumped into this one by mistake.
it's True.
F4 is for dev stat not for player

but see if you want.
I want to help in development but after the 2 of july, i have experience in game programming and 3d modeling. I wanted to first look at the code but i couldn't understand anything( you should really start commenting the code, especially if it's open source). Do you have some kind of documents where i can look and try to understand variables and the structure?
Thanks in advance
Welcome,
Download and see svn version