Dual Signup Pages

Have been reading up on the signup process and am getting ready to create the custom signup pages. Understand the process of the signup ( https://premium.wpmudev.org/forums/topic/supporter-options-during-signup#post-53090 ) and how the anti splog renaming works.

Question is once the templates are created (ie. http://edublogs.org/signup-b00/?Pro=1 and http://edublogs.org/signup-b00/ ) how to associate with anti splog so it knows how to change both the urls?

or does it just change the /signup-b00/ piece and the ?Pro=1 is added by supporter?

and if so then what to name the 2 different pages.

Thx