The "always" box will not appear until you run the 3d wizard setup.
I did not use any registry tweak for my setup. What i did:
checked enable stereoscopic 3d box-> ran Wizard-> ran test stereoscopic 3d in N control panel-> set refresh rate to 120hz & select Apply refresh rate to all games box-> exit test app-> uncheck Enable stereoscopic 3d box-> apply
Did this work for you without an emitter? I have no emitter. I used the registry file that Mark posted and that allowed me to check enable 3D. But the 3d setup wizard does not let me progress unless an emitter is plugged in. My test application box also doesn't have as many options as yours.