I don't understand why we don't filter it instead. Wouldn't that be easier? What if you want to Group these game mode specific difficulties? That's just highly inconvenient.
My feature request still stands.
How about a way to filter catch the beat, osu!mania and taiko specific difficulties?
Regardless of what game mode you are in, you will always be able to filter out the maps from other game modes you don't want to be shown.
Remember that you can always uncheck any filter if you for some reason to play more than one game mode.
If you filter away osu! maps in taiko/ctb/osu!mania, osu! maps will be gone and taiko/ctb/osu!mania maps are then left alone. Any osu! maps can already be played in taiko/ctb. But if you want to filter osu! difficulties too, that will be done too.
If you filter taiko/ctb/osu!mania maps in osu!, taiko/ctb/osu!mania maps will be gone and osu! maps are then left alone. Any taiko/ctb specific maps can't be played as an osu! map.
Please come up with suggestions and criticism for this feature request.
osu!mania specific difficulties will be rankable at some point.