membership/supporter integration

The latest membership (beta1.1) plugin has a integrate with supporter feature which is great. Now when anyone joins a membership they get an automatic supporter upgrade - which is something I have always wanted.

I want to have my paying customers to join via membership so have no need for them to pay to become supporters (I want them to pay just the once.) I would like them to be able to claim a free blog however, so

is there any way of turning off the supporter options on sign up?

Basically I wish to strip out the payment options and change the words "No thank you, I will pass for now" to something like "take me to my websites dashboard" .