According to the Python code, allied_control, the list of the controlled allies, is always the player only. So, using units of another player, even human, is probably not possible yet.
Using the units of the computer could be a bit complicated, because a flag would be required so the computer doesn't give another order to a player-controlled unit.
According to the Python code, allied_control, the list of the controlled allies, is always the player only. So, using units of another player, even human, is probably not possible yet. Using the units of the computer could be a bit complicated, because a flag would be required so the computer doesn't give another order to a player-controlled unit.