I tried to use the /r (rotary) value on TRACK_PAN. It doesn't work, and everything after the /r address on the same line is ignored.
Code:
TRACK_PAN n/track/pan n/track/@/pan r/track/pan/rotary r/track/@/pan/rotary s/track/pan/str s/track/@/pan/str
This is the line that's not working. Reaper doesn't send out the pan strings (because it's defined after the rotary argument), and everything sent to /track/pan/rotary is interpreted by reaper as a normalized floating-point argument.
Rotary values should work for everything, right? Not just /scrub and a few other values?