Having romanised source in beatmap metadata would be nice because I can't read Japanese.
Usually, the beatmap romanised source only put in the tags field. Unlike artist and song title, they have their own "romanised" field. The source should have its own "romanised" field too.
So, when "Prefer metadata in original language" is not checked, so the song source would be displayed in romanised source.
Beatmap listing in the web should also be displaying the romanised source alongside with the original source.
Game:
Web:
Usually, the beatmap romanised source only put in the tags field. Unlike artist and song title, they have their own "romanised" field. The source should have its own "romanised" field too.
So, when "Prefer metadata in original language" is not checked, so the song source would be displayed in romanised source.
Beatmap listing in the web should also be displaying the romanised source alongside with the original source.
Game:
Web: