So this feature has been implemented in the test build:
Apparently, FunSpoiler_BackgroundDim, FunSpoiler_Storyboard, FunSpoiler_Skin and FunSpoiler_Hitsounds are now used twice: in the visual settings popup and in the options menu.
Could it be possible to have seperate strings for both of these locations? One in the singular form for the VS and the other in the plural form for the options menu. Right now, it sounds weird in some languages to have the singular form used in the options menu while all of the beatmaps are concerned by the toggles.