LOGIN SETUP for Customers and store members.

I am trying to create a marketplace using MarketPress.
I would like to have two different login places on the first page; store registration and customer registration. Is there anyway to let members to fill out a store registration form before logging into store admin page. In the current setting, I only can set up login for store registration and anyone can access to store admin if they provide an email address and password. Is there any way to have “Merchant Sign In” and “Member Sign In” separately? Or, is there anyway to have a single login screen and have users with different user levels directed to different places?
Thanks,