Hello !
I don't use Tauntmaster, But after read the description on curse, I think it's very simple with RDX
Make a windows with header layout (for display raid)
use "Color variable Threat Color" (it's my feature, but I don't know if it work with cataclysm.. I'm not use it anymore)
And play with frame and show/hide condition
And use mouse binding tu make the "taunt" on click.
I make a Recovery in a few minutes