I had almost the same idea and so I'm happy I found this post.
With a mod like this you can play your favourite beatmaps until you reach your very limit and even easier difficulties may become interesting again.
Sure, the song might sound a bit strange if it is played too fast but I guess that wouldn't matter that much in the end.
My idea would be more like a slider where you can adjust the speed.
No clue about the exact speed increase/decrease amount but something like x1,5(double-time mod) x1,6 x1,8 would be my suggestion.
With a mod like this you can play your favourite beatmaps until you reach your very limit and even easier difficulties may become interesting again.
Sure, the song might sound a bit strange if it is played too fast but I guess that wouldn't matter that much in the end.
My idea would be more like a slider where you can adjust the speed.
No clue about the exact speed increase/decrease amount but something like x1,5(double-time mod) x1,6 x1,8 would be my suggestion.