Although changing key commands from the menu covers most situations, there are some, specifically the command 'learn midi control' (button 2-ctrl-click) which can't be accessed from the menu.
Is it possible to change bindings like this using OSX?
no, bindings that are not in the menus cannot be changed at all. there just isn't any design in place to do this (on linux or OS X). there should be, i would agree. but right now, there isn't.
there are a couple of exceptions: the generic "edit this" and "delete this" mouse button bindings can be changed from the options window.
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