I started this in the other thread. I'm going to flesh it out further here to get it off my chest and clear my thoughts.
I started with special gun attacks like in Anarchy online. AO also has an engineer class who's "pet" is a series of droids.
Obviously you'd have to split up Combat Engineering further since you wouldnt want the ability to do all these powerful abilities with a few credits. Perhaps droid mechanic is its own spin off of Engineering, a peer to Combat Engineering. Here is a list of possible applications for droid making:
Remote repair of vehicles. This can be in a side kick form that you can send out too repair a fixed amount before it returns to your side. It can also be like a grenade. Lob the single use repairbot onto the designated vehicle or MAX.
Moving mines. Lob them and they scurry along the ground homing towards the nearest target and explode.
MAX decoy mines (illusions). They shoot randomly causing no damage.
Portable turret. Well they have this with the Spitfires. However, you cant drop one and man it yourself like the wall turrets. This one you can and you can pick it back up when you exit the turret.
Sidekick turret that follows you around like a familiar and shoots what you shoot.
A roving RC-sized plane that scans for troop location like a mosquito on a smaller scale.
Here are some ideas for Stealth:
A slow passwall ability that only works on outer tower walls and base fences.
A wall meld ability (you can still be shot and detected) or camoflage into large equiptment.
Here are some vehicle ideas:
A 2 person Reaver with a rear and downward facing turret. Pilot has no guns.
EMP bomber that disrupts enemy radar signals used for invasions.
Medical transport (air, land or both) that is fuel hungry and needs to be fed like the ANT vehicles.
EMP versions of the Wraith or Basilisk to disrupt enemy radar.
2 person Wraith or Basilisk.
Aircraft variant of the Wraith (cloaking). To remain cloaked the speed is slower than Wraith but you can fly. Perhaps even to stay cloaked you need to be hovering.
Well thats it for the first pass brainstorming...