As a possible workaround for the 4 player creation (posted on Steam thread as I did not have an account here originally)
Depending on how you can script the game flow... Is is possible to have the existing character selection screen for the first two then the next game 'scene' is the character creation screen again for the 3rd/4th characters?
Original post:
re: 4 players from the start (and the lone wolf issue) is it at all possible to run the character customisation screen for the first two chars as normal, then instead of going to the game when finished and accepted, it takes you to character customisation screen 2 for the following 2 characters? This would also allow you to run a test for the lone wolf perk (ie. if both initial chars have it then you cant make additional, if one has it then there is only one char on the second screen)
Not sure how much you can script the flow of the game from char customisation to gameplay but if it is possible it would get around the GUI issues at least