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Dave, thanks for this great tip.
I had chosen the standard Apple remote and this limited the amount of buttons considerably. But Remote Buddy allows virtual mapping (another thumbs up for you Felix on enabling this!) of multiple remotes functioning simultaneously so this indeed allows extension.
I searched a little more on internet on this topic and I found the following tutorial: http://miniharmony.blogspot.com/2010/06/episode-2-preparing-harmony-one-to-be.html
Useful for any other RB users having a similar question on how to get this operational. It's written for a harmony one, but I'm sure Logitech has enabled the "Plex" remote settings for other Harmonies as well. This is quite essential if you don't want to teach the remote all settings manually...
Of course I would still like to ask Felix to work on an update of AJAX to make better use of the iPad interface and add a couple of extra programmable buttons, so we can also employ AJAX with a bit extended functionality :D
Kind regards
Jurgen