Thank you @progreen.
The feature got some -- very good -- testing on the forum before we felt ready for a Google Play "beta".
Re: groups / categories
This is not supported because of a limitation of Android's Contacts app:
The editor (when you view / open a contact) "knows about" Gmail and Exchange accounts built into Android -- for all other apps, it's entirely different and does not support editing groups (I'm not sure about showing groups).
There could be third party Contacts app that do, but so far I haven't had the time to look at those.
I'd be interested in what other mail apps -- not Gmail or stock Email but let's say Nine or Type Mail -- do in this area.
If there is a way to implement this (if seen in "other apps"), I'm interested, but not sure it would happen in this release, most likely would have to be the next one.