After uninstalling RST using it's uninstall program, I've noticed it left behind some files and services, specifically HfcDisableService and RstMwService. I've noticed that these files belonged to one folder in the System32. I've also noticed that the added feature for RST in the BIOS still remained.
There is no "added feature for RST in the BIOS". Windows cannot affect the features offered by the BIOS nor can it change the BIOS configuration (that would be a security violation). In his response above, Al detailed the changes that you can (but don't necessarily have to) make if no longer utilizing RST support.