Your right Christian was talking about the cart sorry for the confusion. Yes you can configure the registration module for offline payments or registration only.
The following are two options for configuring offline payments:
Option 1 - In the module settings if you enter a zero price the checkout skips step 2 where the user enters their credit card information and the user is able to complete the registration without entering payment information.
Option 2 - In the next release of the payment registration module v3.32 we added a manual gateway option that allows the user to enter their credit card or check info but the module will not attempt to process it real time, the module will store the customer and payment information to the database and you will be able to process the credit card or eCheck at a later time.