I don't think there's anything wrong, or at least that there are no major technical issues with Commando class healing so far. I also like the idea of a trooper calling for healing/support drones, IMHO that is a great idea for implementing healing for a class that doesn't use force.
I have a problem with one ability though, unfortunately it is the main ability which your will use all the time a healer.
HOW AND WHY DOES HEALING-RAY (???) COME OUT OF A BLASTER CANNON?!
It's ridiculous, looks weak and makes absolutely no sense iwithin star wars universe. It is star trek-grade stupid, midichlorian-like silliness. Other classes either throw kolto packs at allies, or perform medical scans and it works fine within the Star Wars lore. But shooting healing bullets? That is an awful idea.
IMO if commando did the same animation as a smuggler (simple medical scan or sth) it would fit better and give more of a field medic feel to the class. I hope more people agree or have better ideas and it will get changed.
I tried to be constructive here, but c'mon - this design is seriously retarded, am I not right...?