I love the ability to specify the tone or voice of the text that it generates and there are a lot of choices, but I think it really need one for sarcastic. It's a specific tone that won't apply to everybody (and every piece of content) but it can be used effectively and really is like no other voicing in the list. This is not an immediate need but is more of a nice to have, since sarcastic is a bit of an oddball.