This posting is older than 6 months and can contain outdated information.
Yes, I have the list of the Plex Harmony assignments and have used it. But it still means going through the list, looking each command up, and scrolling through the list of Apple remotes. It is a lengthy, error-prone process, and you have to do this for every program.
It would be a lot easier and faster if I could simply point the remote at my Mini, hit each button in turn, have the corresponding Apple Remote command highlight on the screen, and then select the behavior that I want for that button in that particular program.