I was going to call them 'Repair Drones' but we already have drones so now I'm confuzzled.

In any case how about fighters with healing weapons? (same tag as a shield trans so they can only target players/friendly players).

I'm sure there's a good reason not to implement these but... it sounded fun.

EDIT: Although, now that we're talking about repair drones... how about drones with a repair function (similar to that of the AI base)?

Fighters that heal you. Lol fun.

Drones that repair your items? So like... an ACharge that uses credits instead of energy to deploy? Lol.

....Engineer credit beams. lol. "TAKE MY MONEY"
Or part generators. Engineer items that convert credits to parts.
The spare parts system does seem to fit in with the engineer theme.