How about adding folders and subfolders to the ScummVM GUI? The game list would be much shorter if the games could be sorted by game series or game company. The easiest way to switch folders would be the MS-DOS-style method with /. and /.. as top entries. This method is also used in may DVD players. Collapsing folders would be nicer, but it'll require a more advanced GUI.
I'm not sure what you mean here... ScummVM already supports folders and subfolders, in fact all of the common file code supports this. Could you elaborate?
Oh sorry, you're referring to the ScummVM game list, not the file browser