Oh you can. But that uses the commander's function. The normal peer commands dont work - i.e 'bail out', 'go, go, go' etc.
We already had a poorly mapped interface back in 2.0, now that its gone 1942, those direct links are all lost.
The only reason move orders work is because they were fixed in online play and use the commander map interface, and THAT part of ai wasnt tampered with - its basically vanilla.