[Fyron]

but seriously thinking about it, maybe it would be possible for a very smart modder to put it in...

If that was possible, it would have been done by now. Geo is correct.

when you launch a drone, they go in to a group of their own, maybe get something that launches like a drone and goes through warp holes, but acts like a fighter in battle, then you could quick produce fleets of ships.

Vehicle hull types are not moddable.

Something I have never worked out how to do, if it is possible, is when you have launched a number of ships, adding or removing from that group of ships

Unit stacks can not be divided. They have to be recovered and relaunched.

the only thing I can not think about is maintenece on units, but surly that is something that is set to 0, and not actually built in units are 0?

It is hard coded.