[Pathfinder] need a GM to run the Rise of the Runelords AP
See, I've tried that. And nearly every time I allow everyone to make characters, I wind up with that one player who takes three weeks and still leaves out something important like their equipment.
You might be able to whip out a full character, all ready to go, in a day. So can I. I'm not making that restriction to penalize players like you, it's to get the other kind up and moving.
Most PbP games stall either during character creation or during the first 'session'. If you can skip character creation entirely, and just say "Here's your characters, let's go", you've already given the game come vital momentum that might get it past that initial hump.
And anyway, I'm not talking about limiting later advancement. When those pre-gens gain a level later on, the players are free to do what they want with them -- I'm not going to go in and say "Here's what you get for level 2". Not unless the players want that, but it's unlikely.