I remember that feature and the memo key, and I was soooo sure that I could bet it's been readily available for years either on hive.blog or on peakd.com
..and good thing I didn't, because it's not there :D Or I'm too blind to find it. My my. Encrypting memos, such a nice feature, hive/steem had the memo key, like, always, so irritating to use.
Why did they block you? Did they have any good reasons to cut the memo encryption so it shouldn't be made easier to use?