One man factions should not be a viable gameplay choice, you should be required to have friends or allies from other factions if you want to survive in the factions world.
adding onto this somewhat.
even in single player the player would want to take over command of one of the NPC factions if they want to have a large faction.
A small one man faction on a single player world would be extremely difficult to set up before entering the imperialist stage without the use of admin commands or help from the NPC factions (if those can help the player at all).
On multiplayer you would want a few friends to get the faction set up to the imperialist stage and to function in the imperialist stage, because I am pretty sure a large faction on a multiplayer server would be a very interesting target for other factions and even players who go about business on their own (such as the fighter player thingy, basically a mercenary) and so for an imperialist stage faction to survive it would need several members doing their own thing towards the upkeep of the faction, a lot of things would be automated such as mining and fleet building, but the fleet fighting would be limited to telling the fleet to go to a sector where you can meet it and then commanding the fleet battle from within the fleet.
Actually I like the no unloaded fleet combat, because if players want to attack another faction with fleets they would have to actually think about where to put them before attacking. And I think scanning systems unveils the location of fleets, both friendly and enemy fleets, so intercepting a fleet is possible.
Im sure you can still tell fleets to move to an unloaded sector outside of where you are going to attack, and then a player can travel to that sector where the fleet is and command the fleet battle against what they want to fight.
I have not had much sleep at all so excuse me if any form of idea or meaning is lost.