'select same type' key should only select ally units, if you have their units selected.
if you only have your units selected, the 't' key should not also select theirs.
'select everything' key does not work in share control.
ability to change ally mcv to 'home' would help a lot
using shift key to select multiple of ally units only works when click-drag, but not when single clicking one at a time.
ability to set rally points would be awesome.
if ally has something on a waypoint and you control it, it will go back to their waypoint. (side question: is it possible to see ally waypoints?)
does not really work with nod: cannot undeploy ticks/artillery.
you can put units into ally sub and send it somewhere, but once you deploy you cannot put units back in sub OR move sub again.
stealth tanks un-select when stealth/un-stealth
when controlling ally aircraft and it goes through shroud, the aircraft is un-selected.
ability to control sams?
Can you select stealthed units at all (regular stealth generator?)
ability to see what ally is building (via spy, or coach mode, etc).