Right now if you're playing a 120bpm track, the only way to sync a 60bpm track to it is to unlock the 60bpm track and hit the 2x tempo function and double the grid lines. Especially given how a lot of rhythm-driven modern music works it's perfectly reasonable to want to sync half/double/third/triple-tempo music without having to jump through these slow and risky (your grids may get messed up when you revert etc) workarounds.
