I typed a long post, but my browser crashed.
Bottom line: SBSettings(3.3.1) did NOT work for me. It messed up my iOS 5.0 GM JB. I had to re-restore.
Some details of SBSettings not working with iOS 5.0 GM:
1. Upon a reboot, I was greeted with the message that the OS is too new, and some functions of Activator are not working.
2. Screen is locked in portrait mode.
3. When I launch an app, it immediately shrinks to a small window. Later, I ralized that it was the window of SBSettings. That small window of SBSettings works, but any other app, no. You touch it, it's not responsive.
4. App icons are smaller than usual. They are scattered 4x4 on the spring board, leaving huge spaces between app icons, making the screen look like a piece of Swiss cheese.
This was on my 1st gen iPad.
I have since restored and re-JBed. I did not install SBSettings this round, but installed MyWi and 3G Unrestricter. So far, everything is fine.