In any case, make backup of your current system to different partition or directory. Then you can always revert back to original, check versions, copy newer files back etc.
I myself would install it by myself without any installation scripts. I could check then what versions I have of files and what versions would come with 3.1. Practically copy file by file with thought over old installation. And compare startup scripts and make 3.1 modifications if needed. It's a hard way, but then you have control that "new" 3.1 files won't replace possibly newer files which you've gathered elsewhere than original 3.0 installation.. and your own settings won't be overwritten. WB3.1 isn't too big for such installation and good filemanager will help
But I guess it's not comfortable for everyone
It shouldn't affect to RAD: in any way... 3.1 isn't that different to 3.0.
