Please don't hold your breath breath if you're waiting for for their attentions. After years in the Opera forums I doubt that people who work at Opera spend more than a few minutes a year if any time at all looking at the forums.
I miss Opera classic as well. I'm afraid Opera Mail is, and wil remain, just a pickout piece of 12.16 infact, it has the same porblem of 12.16 (when you open a new mail and delete the signature the app freezes the same way 12.16 does)