you can simplify the menu further and get what you are looking for 
with new options available in the latest version of Remote Buddy at 
Preferences > Menu > Appearance & Settings.

If you want to always open the menu at its root level, that's also 
just a click away in Preferences > Mapping > Global mapping: for the 
menu button, simply select the action for openeing the menu at the 
root level and that's it.

Setting a Behaviour as default behaviour is an advanced option (and 
therefore intentionally hidden) for very special use cases and is 
*not* generally recommended. You really shouldn't set this option to 
anything else but "None (recommended)" - but especially not to an 
application - including Front Row, as that will always mean that app 
is launched.

Hope that helps.

Best regards, 
Felix Schwarz