Well I don't have the pro version so I can't check it out.
However, that said, it would depend on exactly what you enter as the parameter at the end of the line, given what PK said:
0 = hide, 1 = show always, 2 = show only for admin users.
If you put 0 them presumably it hides that option and you can't use it perhaps you should try =1 as the parameter.