Upgrading from Ubercart Subscriptions

Most excited about the commerce.module, imported from Ubercart and created a view that shows the order date, membership product and amount. So that is all good :)

As my memberships are 3, 6 and 12 month options, will have to manually update each user (over 6000+) to their expiration date (presuming that this cannot be done programmatically)?

Is there any chance that the 'Subscription validity' field on the user edit page have an easy date option, ie pop-up calendar or 'add 60 days' or similar please? This is so I can update each user's membership validity.

Currently with simplified Format: 2012-07-23 17:36:22 it's going to take weeks to do one-by-one.

Thank you for this fabulous module!