Alias support

pEp for iOS (not sure about other platforms) does not seem to support sending from email aliases. That's a feature that most email clients seem to support these days.
For uses that have more than one email address associated to the same IMAP account, it would be a major improvement being able to go on the settings for the account and add the alias email addresses configured in the server so that the user can pick which one to send each email from while composing.