A GM can potentially need almost everything, I fear. Sometimes random threats are called for, another time the GM needs a very detailed timeline to keep track of events. Depends on the GM, the style of his (her) gming and of course, the adventure. I tend to agree, that a character generator isn't needed - I never use one for NPCs and I don't normally build characters for my players, so I need something to display the stats, but not something that helps me create the stats :-) A functionality to import/convert files from different character generates would be nice, though (and is already prepared), but that depends very much on the knowlegde how a certain character generator stores the characters.
As I normaly tend to improvise very much, I don't have a big need for a very sophisticaed, almost computer-rpg like system to keep track of scenes and story (only one to keep track of my notes&pictures), so unfortunately, I will not have time to do it, but of course, nothing stops other people (including you) to write such a plugin :-)