In reply to:

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Another thought I had was to use key combinations (i.e. up and down at the same time, in the same way Car Alarms give you "3 functions" on a two button remote. I know we already have short press and long press on all buttons, so I wouldn't even suggest a "medium" press...

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It was discusse a loooooong time ago (alpha mk1 days:) ) that the remote can't distinguish between one key being pressed, and two at the same time..
-mark

...proud to have owned one of the first Mark I units