Nah. I prefer a brand new character.
It just wouldn't make sense for a person to realistically cross post-apocalyptic America for no reason, which is my reason (God knows how many times we've said this to the "XP carryover" whiners).
Yeah, but...Ssssshhhhhh, hahaha.
I'm not really a big stickler for details with my role play. I have my characters background and specifics in my head, any game play mechanics can be tweaked without problems.
I also am a big proponent of cheats, I used them along with lots of mods in FO3 and I played the crap out of that game. Doesn't effect my role play.