For what it's worth, my 3 boomkins use this:

http://www.dual-boxing.com/showthread.php?t=25199

It basically just winds up rotating between starfire and wrath, but my dps went up a major amount by including that into two seperate buttons. No micro-management, no addons needed, just two click buttons: one for Wrath, one for Starfire. Works wonders and doesn't mean having to watch for multiple toons proccing something and then changing your button mashing depending on that. One boomkin, that's cool, 3? Not a chance.

Good luck!