[css3-text] hanging-punctuation and hyphens

Somebody suggested on twitter [1] that it might be useful for hyphens (added by hyphenation) to hang as well, perhaps through hanging-punctuation [2]. Thoughts? 

[1]: https://twitter.com/kevinmarks/status/309851430934675457
[2]: http://www.w3.org/TR/css3-text/#hanging-punctuation0

Lea Verou
W3C developer relations
http://w3.org/people/all#lea ✿ http://lea.verou.me ✿ @leaverou