I had an idea about how drones could be beefed up, or even personalized... though it would probably mean a lot of work to the UI that I'm not sure would be an option.
My though was to allow you to customize your 4 drone choices in a similar way to the servos, but in a lesser manner. say they get 1 armor slot and 1 weapon type. That way you could diversify your army to your play-style, instead of just your servos. I would say no abilities though, that would just add too much to micro.
Example1: If you like using ranged drones and having your servos be the damage sponges:
Drone 1: Frost Armor / Acid Catapult (AE damage with low single target damage maybe?)
Drone 2: Acid Armor / Fire Gatling Gun (Fast rate of fire, single target)
Drone 3: Fire Armor / Frost Gauze Rifle (Low rate of fire, longer range, higher damage... maybe at the cost of armor?)
Drone 4: Shielding Armor (extremely low armor once shield is down) / Healing Beam
Example 2: If you like your servos ranged and have melee drones:
Drone 1: AE Armor type? (Low single target protection, but better vs. AE damage?) / Big Frosty Drill
Drone 2: Frost Armor / Grappling Claw (roots a target in place and does Damage Over Time until the Grappling Drone is destroyed)
Drone 3: Fire Armor / Shield Projector (Puts a shield of sorts on all units in range, but does no damage on its own)
Drone 4: Regular Armor / Healing Beam
This would give the player many more options in regard to strategy and tactics.... Do you want your drones to specialize in AE damage or single target? do you want them to specialize in assault while your servos support? How about having the drones support the servos in the form of Shield Projectors, healing, and grappling drones to hold the enemy in place? The big problem I see is this may be too much effort to balance.
A lesser way you could customize them in that case, would be to only allow changing armor and weapon damage types...
Example:
Drone 1: AE Armor Protection at the expense of taking more single target damage / Acid Damage Boring Drone
Drone 2: Acid Armor / Fire Damage Minigun Drone
Drone 3: Fire Armor / Healing Drone
Drone 4: Frost Armor / Frost Damage Catapult Drone
