Any direct calls to wp-signup.php in plugins or themes?

In our continuing efforts to battle splog registrations I plan to try the wp-signup renaming tactic, and just ran across this comment in the mu forums from about 7 months ago...

I can't remember any of our plugins calling wp-signup.php. All of the signup form plugins just use the hooks. So you should be just fine. Thanks, Andrew

Is this indeed still the case? We've got TOS and Blog Tagline running on the signup page. Also, anyone know of any direct wp-signup calls in the themes offered here?

Thanks!

PS: Oh yeah, we also implemented the new Supporter option at sign-up!