Hi Alex,
Anything that I can control externally. Like an encoder connected to a microcontoller over serial.. then I could write a quick routine on the computer to read the serial and set the RIT through to a TCP port or any other connection SkyRoof may have really.
I did see in another comment that the mouse scroll-wheel would do it, so technically write a quick "mouse emulator", but I guess that will require SkyRoof to be the active window.
I've already set up an external encoder for XIT to the IC-9700 over CI-V to an ESP, and I was thinking having RIT control for the SDR on a second encoder would make QSO's on the linear birds very user friendly. :)