I'm new to these forums in hope to ultimately learn how to fix spells and such but when I read this thread It came to mind that perhaps you could set a requirement on a talent thats non-existant.
ie;http://www.wowhead.com/?talent
[improved Leader of the Pack] requires both points AND a certain point in [Leader of the Pack].
I'd figure if you could somehow duplicate the requirement and change the target requirement to an GM only spell, it'd be disabled.
I have no idea wether this is actually possible, I have no understanding of how emulators are done; just a thought I'd figure I could share anyway.. goodluck!