It is useless to show those maps in that mode, though they take space for maps as we hardly play other mode's map.
Excluding maps like them would be nice.
Just group them by modeIf grouping for that, we can't group maps by other, such as bpm, artist, length.
Also, each diff is around 20 kb, that not big at all
The part that takes the most space is Mp3, BG and SB