I can see the moments when this is useful, for example, Beats And Pieces is a song I tried to map. It starts at 70 BPM and anything over 6-7 looks wrong but ends at 200 BPM and anything under 9 looks wrong!
So yeah, this have my support but it better be justified to when it's used as this can be abused very easy.
So yeah, this have my support but it better be justified to when it's used as this can be abused very easy.