EastWest Lurker
Logician
My good friend and Logic Pro Environment genius Peter Schwartz has finally made this available. It works really well for those of use who want to use program changes or keyswitching between articulations in Play, Omnisphere, etc. it is donation-ware.
http://www.peterschwartzmusic.com/skiswitcher.html
http://www.peterschwartzmusic.com/skiswitcher.html