I think a reasonable thing to do would be to send the xls file from the ircode folder with the commands you want highlighted. I've sent excel files in the past, and that seemed to work well for them. I'm not really a Harmony user, so that datasupport email is my only way to contact them besides their own forum.

There are big, active threads at AVSForum, and of course in Logitech's own forum. Sorry to say remotecentral is kind of dead except for a few integrators, hardcore remote geeks and occasional newb. But I think this is still the best site for really technical subjects.