Pro Sites Signup Link Issues

Hi

At the edublogs sign up screen the signup link to start a new pro site is:

http://edublogs.org/signup/?Pro=1

It is located here http://edublogs.org/guide/

If you have anti-splog installed you can't point this link as it always changes.

I believe somewhere in the forums it mentioned you have to alter your htaccess to achieve a proper link.

1) Is it possible for the http://domain .com / pro-sites/ link to work with anti-splog and have the create a site (if logged in) form there too?
2) I am running nginx so dont have a htaccess.
3) If they are logged in, but do not have a site, they have to use the anti splog form, create a new user, create a site, before they can upgrade it.

Can someone clarify, help or point me in the right direction here?

Many thanks in advance,

Johnny