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



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Bar-Stretch-Markers-900.png (272.82 KB, 51 downloads)