I just looked into the RTAS thing a bit.  Seems that Avid is fairly picky about who they let develop RTAS plugins.  At this point, I don't see myself going through the hassle since I don't use Pro Tools.  (It's going to date me, but I'm actually still a PARIS guy…)

The good news is that FXpansion (the BFD developer) makes a VST to RTAS adapter, so I can just worry about the VST side of things, and if you need to stick with Pro Tools, you should be able to use that adapter to run my plugin.