This is the official guide on input maps
Plex HTPC Input Maps | Plex Support
Personally I use a FLIRC USB to set up keyboard codes that communicate with my Logitech remote.
The codes in the link below used to work but I haven’t used them as FLIRC makes it easy.
Plex Keyboard Shortcuts Cheatsheet - Make Tech Easier
Also, as you point out, Plex HTPC is designed to be used with a remote control as a 10 foot interface.
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