Try doing video post with vari tempo music,.... I know I would probably go mad
if I had to do it in current Reaper
But on the bright side, most basic aspects are well done and more efficient,
with some great advantages like elastic audio, real-time pitchshifting,
timestretching and resampling, so you can always work from original source,
no matter how you change tempo during the project. Fits my needs very well.