I got an email from ajs, asking if I would kindly upload my git tree so he would at least have something to merge into 2.82. Oops! Sorry about the laziness, guys.
One piece of good news is that my R4 came in the mail today, and I can confirm that my changes have fixed the touchscreen support for R4 users.
I've only just started playing around with the R4, but it seems pretty cool. My only gripe so far is the slow fading transition to enter the file browser. Free usability tip: transitions shoud take no more than two tenths of a second. One tenth of a second would be preferable in this case.
I also really appreciate the microSD USB adapter that came with the R4. The microSD to SD adapter that came with my card didn't work, so I wouldn't have been able to use it without the freebie!