First, thanks for all the great work on the LaunchBox project. It has totally rejuvenated my interest in retro gaming and I am eagerly awaiting the premium version!
A feature that I would appreciate is the ability to create playlists of games so I could easily group and order titles by more personal criteria than the current options.
For example, being able to create a playlist of:
IGN's 100 best Super Nintendo Games
A list of Metroid-vania style games
A complete collection of Star Wars titles regardless of system