Reaper support is a bit spotty, to say the least. Transport, fader and pan work. Some buttons work, most don't. Track selection is very buggy and unusable. Would it be possible to add a Reaper mode at startup that fully integrates with Reaper in both Windows 10 and Mac OS? There are some workarounds for Windows, but Mac OS support is in a worse state.
You can read some about this topic in a post I made a while back on the forums: