In Morrowind, when you loaded up the launcher, you could select a save that you wished to play, and it would load all ESPs associated with that save. It was a handy way to make sure you didn't accidentally miss something our when playing several different characters at different times.
However, I can't seem to find any way to do that in Fallout 3. Does anybody know if it's possible, either with the ordinary launcher or with FOMM?