Uninherited timing sections must be the same in every difficulty of the mapset. That is, each section must have the same BPM and offset in each difficulty. Furthermore, there must not be extra or missing uninherited sections in any difficulty. A song's timing doesn't change between difficulties, so there's no sense in having different uninherited sections per difficulty.This sound like the kinda thing that could be enforced by the program considering that these are a property of the song(mapset) and not a particular map, much like the song title and artist.