This posting is older than 6 months and can contain outdated information.
Thanks for asking.
Regarding
1) To activate a particular Behaviour, go to Prefs > Mapping and pick
"Behaviours > Activate Behaviouor XY" from the popup for the
respective button. If you have set up your Harmony 880 to only emulate
the six buttons of an Apple Remote, however, I'd definately not
hardwire any action to either the Menu or Menu (Hold) buttons. Six
buttons are really the bare minimum to control a Mac. Dedicating a
button to a single action does exactly that - with the consequence
that it's no longer available for contextual control of applications.
My recommendation therefore is to either teach your Harmony 880 with
the codes of another Apple Remote and use RB's support for Multiple
Remotes - or - launch Hulu and Boxee from Remote Buddy's menu, which
you can customize, if you like to.
2) Remote Buddy includes both a configurable menu and built-in file
browser. Of course you could create a Behaviour to control aspects of
the Finder, but I think you really wouldn't want to do that as better
alternatives are already built-in and ready to be used from a distance.
Best regards,
Felix Schwarz