You should remove the highscore when you are playing in nofail, because thats just dirty! 
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Remove highscore in nofail [Resolved]
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Was thinking about this just after I released that feature, actually! Will proabably change for next version - but for the moment, scores recorded while the mod is enabled will be drastically reduced as to be comparable to any normally achieved scores.
Odds are, if you get to the point where you're failing the song, your score won't be that high anyway due to your combo being broken. 
I kinda like scoring while in no fail mode, the multiplier is reduced so much that what ever score you end up with usually isn't worth talking about 
It's more like a guide for players to see how much better they can actually do without having to worry about failing the song, IMO.
It's more like a guide for players to see how much better they can actually do without having to worry about failing the song, IMO.
Yeah, I think allowing highscores to be set with nofail on is a good idea, so the player sees some measure of progress. If F ratings are given if and only if the player has (or would have) failed in a nofail mode, then it would be quite useful to use that as a differentiator between a "dirty" score and a proper score.