Here's a link to the Ibanez site for more info on the bridge.
http://www.ibanez.com/eg/guitar.aspx?m=JS1200
The JS is tuned regular 440, I don't detune/change any of my guitars. It's a major pain to re-adjust a floating trem guitar.
The B guitar is set up as a B guitar and stays that way all the time. I don't use the trem on that guitar any more. I have the bridge locked down tight against the body with 5 springs.
I have some pics of some of my stuff here.
http://www.el34world.com/Hoffman/ampphoto.htm