What about flared hairpins? Like these… http://lilypond.org/doc/v2.18/Documentation/1d/lily-9b811544.png
Will they be implemented in the future? I know very few people use them but, unfortunately, I’m one of those few. 
Antonio
Yes, we could potentially implement support for this in the future. I can’t promise when, however!
Oh, that’s fine! I know you’re focused in more urgent things right now. Just keep it in mind for the future, please. I don’t mind waiting.
Thanks, Daniel!