Something I would love to see, would be the ability to search for games 
but be able to pick systems/settings that the game seeker specifically 
does not want to play in. For example, after some twenty years of it, I 
am totally burned out on D&D in all forms.  I'd love a way to be 
able to search for games, but exclude all AD&D, D&D, and PF 
results, as well as any other system I don't feel like playing in.  Just
 an idea that wouldn't be too hard to implement (in theory) and I would think I 
can't be the only one who would appreciate the added functionality.