I believe it is possible to do this. When the game started we didn't have the actual leader in game yet due to headstart and once he got in we were able to transfer it to him. I don't know the exact details of how it was done, but i'm sure you can do it.
The reason I ask this is because he is still in the proces of doing the personal stuff so we cant check it out for ourselves yet. I am currently rank 7 in the fleet and all options are ticked but I dont have permission to set for example fleet uniform. Certain details that only the fleetcreator can do.