If you allow auto-renews to be edited in the Admin you will be able to change a membership status without canceling the membership.
1. Check the ‘Enable Editable Expirations’ checkbox on (within?) ‘Affiliate Settings’.
2. After changing your settings, go to the ‘Billing’ tab on the member’s profile and click ‘Change’ next to the membership expiration date.
3. Here you can check or uncheck the auto-renew checkbox.