Glad you brought that up. By the rules, the only thing you can do in CC are attack actions. It seems a common house rule that I found my crew is not the only one playing, is that the individual in the middle of a squad, where he and they are locked in CC with the enemy, we play where the Individual can command the unit to activate, at the cost of an action as usual. Basically the idea is "Sic'em boys!!"
By the book this is not permissible, but a lot of people play this in their home games, and if you and your opponents agree to it, then play it and enjoy. It hasn't broken the game for us and seems natural that this command to "ATTACK!!" is not so complicated or far fetched.
Again, by the rules, you cannot give orders, so take this for a fun house rule, and not a rules arguement.
Cheers.