Crews are dependent on;
1. Availability
2. Time-zones
3. Activity of the ship
4. Readiness to attend ship when needed
5. Costs of employment
Most privateers don't have crews, hence a pilot gun is needed.
1. There are always people looking to travel whithout having to afk while traveling hence need warps, reduce your price they wouldn't mind defending the ship.
2. People are from every time zone, if you don't find people for 1 you won't find people in space so gunner is irrelevant..
3. Ship can be as active as you want.
4. 10 min would be enough, let time to yourself to go to storage, check auction, pee whatever.
5. If you want a pilot gun that means you planned to do that alone so all cost for yourself, with 1. you can even have profit so if you want to have a crew quicker, just offer free ride, it won't cost you more...
Having a pilot gun would imbalance space greatly and would remove the teamwork needed to handle privateers and larger vessels.
Following your logic, i hope that MA would release a new kind of quad with warping capability which use new warp device at a fraction of the cost cause the size. So it will be balanced, as the cargo missions will offer privateers and mothership a greater capacity while having repairable SI and such logout option they abused.
MA should provide a way to bypass the afk space hassle. As a space investor you don't encouraged people to use space so you failed in your role since 3 years. Time for a change.
Hence warp on all ships is needed.