Hey Aali,
you should create a hacked out or brand new version of FF7Config.exe which contains the third option to use your driver and takes care of modifying the registry based on the windows version, and maybe the possibility to set all extra options trough simple check marks or drop down menus inside it. And to make it perfect even autodetect older graphic cards and set the use_shaders option on know gfx that needs it, detect current resolution, wine and so on.
I know it sounds like a lot of work but that will make it the perfect driver. Easy and powerful. Just right for a 1.0 release (even with an installer)
EDIT:
Almost forgot, it will solve the problem where FF7Config, if opened after the reg file is imported, will set the Driver value back to 1 and screw everything up