The default Kodi keymap uses the enter key in keymaps.xml so that you press enter while highlighting a movie to play, and during a movie if you press enter the OSD comes up with play/pause pre-selected so pressing enter pauses, pressing enter again unpauses.
I'd set the harmony to be a normal MCE remote and it should "just work" with a standard-ish LE image using meson-ir that understands MCE command, or worst case you can create a custom keymap on the LE side that understands all the harmony keypresses. You won't be able to teach the harmony play/pause without something that sends play/pause.
I'd set the harmony to be a normal MCE remote
Sorry to be a PITA, but can you expand on this. Do you add another device to the Harmony and if so what one?
Microsoft "Media Centre Edition" was a short lived version of some older Win release. Lots of manufacturers shipped "MCE" compatible remotes with their boxes and Harmony can replicate the standard remote. I can't give more specific instructions about configuring Harmony devices as I have never owned one (nor do I plan to get one).
