Is there any way to customize the /wp-signup.php process??

Is there any way to customize the /wp-signup.php process??

For some reason, it is bringing in my home page "revolution slider" from my homepage. is there any way to disable that, and use a different header??

Also, would like to add a sidebar. Does all of these need to be done via the signup.php file? Or is there a way to do it through the ProSites plugin?

Thanks,

Sam