The feature I would like to see in serato dj pro is that a track with beat warp markers should be able to change tempo with other tracks that are synced to it. This means that I should be able to have a track that changes tempo and have it as the 'master' track in sync mode, then when other tracks are synced to it, they will follow the tempo changes. This could be implemented as simply as a 'lock sync master tempo' option in the sync settings, where the current behavior would be with that option checked 'on', when turning it off, synced tracks would not sync to the tempo but exclusively the beat grids of other tracks thus enabling tracks with beat warp markers to change tempo and have tracks synced with them also change tempo.

An example usage would be to have a track (A) that goes from 128bpm-100bpm with beat warp markers set up, and another track (B) that is just 100bpm. This functionality would allow the user to play track A, and set sync ON on that track (with 'lock sync master tempo' off), then play track B and sync it to track A, track A is playing at 128 track B has synced to it so even though it's tempo is 100bpm it will now speed up to 128 due to the sync, then as track A slows down, track Bs sync will detect this due to the beat warp markers and gradually slowdown, maintaining sync.