I updated this to give a bar or [grid] beat option (so if you right click the snap magnet and set it to 1/2 it will insert the stretch marker every half bar), if you have sustained notes like a bass you get an artifact where the stretch marker is, to remove them from a sustained ending use (beat won't work with the grid set to swing, that's a Reaper issue, so use bar)
Item: Remove all stretch markers in time selection
right click Save Link/Target As
ReaTrak set item bpm and fit to project tempo map.lua Actually having the stretch markers already there is brilliant because BiaB tracks sometimes tend to "truncate" certain measures, and it would be uber useful to pull out the waveform in just the right places without having to set them each time (assuming I'm understanding the operation you're bringing up here)