Seth, What exactly was your issue with Custom Post Type support in Revisionary?
Revisionary does support previews of Pending and Scheduled revisions, just not from the edit form before you have saved the revision. It's a technical hurdle I may or may not overcome in the future. If your revision previewing problems were with WP 3.2, the updated dev code has some fixes for that.
Suppression of edit form UI for non-revisionable items is intentional. I delved into Custom Fields revisioning for a client, but the WP plugin API doesn't really support that type of filtering. At this point it's a new adventure with each WP iteration, so I'd be foolish to voluntarily support it for thousands of discriminating users such as yourself.