I think your more likely going to see existing AC's be tied to existing classes. Trooper being able to select sniper, Agent being able to be a spy using a single blaster pistol, Smuggler using rifle and give them a catchy name, or a Bounty Hunter using a cannon. The hard part would be force users having a 3rd AC to choose from. A new AC would incorporate existing voice work for class quests and re-use existing animations from other classes, since we have so much adaptive armor animations would not be too difficult. When ever a game adds a new class you have to spend way more time than needed with balance and such and there are a lot more things that could be added to the game vs new class balance/expansion.

for troopers Jaxo really needs to be added ... I'd like to see gender optional too ... maybe female troopers pickup SIS agent ... males have Jaxo join on. Also it would not be a bad thing if Troopers had a force user ... or someone who is not heavy / aim gear. been a lot of times in raids that something drops that no one needs and everyone rolls for light force gear and us troopers keep wondering what this whole "roll for companion gear" thing is all about.

I'm playing a male trooper so I have not had to deal with this exact problem, but I'm thinking that in real life this works so try it in game. Get a water spray bottle and every time he does something you don't like spray him in the face with water. It works on RL cats so I'm thinking it should work on him too.

actually the trooper rank progression makes some sense. You start out a sarge ... get a battle field commission since your the only one left and start out a lieutenant and work your way up the Army/Marine ranks of an officer.