Hi,
Thanks for your suggestion. We have been working with our registrar partners at eNom and ResellerClub to implement this necessary (but unsexy) feature. I'm pleased to advise is has now been implemented in version 7.6 - currently undergoing beta testing:

Documentation

Feature Spotlight Blog

Please help us test, and share your thoughts and experiences with this feature in particular in this dedicated thread: Domain Verification - Share Your Experiences