these drones enhance your mech instead of attacking. here are some examples.
missile production: gives you missiles each turn
bullet production: gives you bullets per turn
multi production: gives you missiles and bullets per turn. not as effectively as single producers though.
healer: heals you per turn.
coolant: cools your mech down automatically per turn.
energy: gives your mech energy per turn.

speaking of drones, i think there should be mech bodies capable of using 2 drones.

I agree 110%, this is actually the reason I came to the forums.

I was also thinking along these lines for weapon slots as well, you could boost you ammo of a certain type or heat sync or energy stabilizers, however you would be reducing your mech's versatility in combat as you would have fewer weapon slots with which to utilize.

My two cents.

For regenerating ammo,I think it would take MORE than just 1 turn.
As for the regeneration drones,maybe we can take a turn to choose if we want the drone to heal us,or lower heat,or regenerate electricity.