Wow, I didn't realize that you could sync the S at 1/1000th with CS lenses. The ability to switch between FPS and CS is an amazing feature of the S2 and S.
Yes, it is quite a valuable feature.
Just worked with both shutter modes yesterday at a really cool wedding.
Did outdoor portraits at a lake shooting into the sun with a specular lake behind the subjects ... use a Hasselblad HC50-II on the S2 in Central shutter mode !@ 1/750th, and lit them with a Profoto Acute 600B AIR and Elinchrom 39" Rotolux Deep Octa ... then went to a 1950s style burger joint and shot candids of them in available light with the S2 and 35mm in focal plane mode.
The real revelation was first real use of the Leica MM ... jaw dropping results ... including shooting a skimpily lit cocktail party using ISO 2500 to 5000 ... unbelievably clean with beautiful tonality.
-Marc