I think the best solution here is to just wait until there is a problem. If a map is ranked, and it turns out that it becomes absurdly abusive when converted to another game mode, then it could be modified online to have that mode's score submissions no longer reward ranked/total score or pp (but the actual leaderboard could stay)
that should be a relatively small change on the dev side of things, and it doesn't require anyone to have knowledge of other game modes
e: I was going to look into this one myself but I guess most of the score submission stuff is on osu-web-10. open source when
that should be a relatively small change on the dev side of things, and it doesn't require anyone to have knowledge of other game modes
e: I was going to look into this one myself but I guess most of the score submission stuff is on osu-web-10. open source when