It would be nice if there was a way to filter or select aircraft based on various criteria. Say you just want helicopters, or maybe just the jets, or aircraft by Boeing, or maybe WWII-era multi-engine aircraft. Maybe have some way of marking aircraft as favorites, adding comments, etc. as well.
Yeah it sounds a bit silly perhaps, but with the potential for an ever expanding aircraft library this might be a good thing to consider implementing in the future. I'm willing to bet that the people who collect sim planes would appreciate a good organizer.