I don't know if that would be such a great idea. It would mean quite a change. What I would like is the ability to supply your own node titles. It's my main reason for not using the PN: some names are very long, and some don't really fit their contents. Being able to have your own node titles in the PN, you can add prefixes (or dingbats, even) for grouping.

++ vs lbh qrpbqrq guvf hfvat n ge va Crey :)
Nabgure bar vs lbh qvq fb jvgubhg ernqvat n znahny svefg.
-- vs lbh hfrq OFQ pnrfne ;)
    - Whreq