OK occured to me: only an option : import from MP available when entering Singleplayer, then all changes in SP that took place during play are stored in some sort of LOG or something, and when clicking Multiplayer all those changes are applied to the carracter immediately.
Not so technicaly immposible to me (but hell, i can dissassemble computer blinfolded in 120 seconds an tell you exactly what part does what, but i can't program for sh't)
I believe simply rejecting an idea just because it need work is not like all you guys should be acting.