I think I'll take a stab at this one soon.
Before you do, you should ask Miller what exactly his comments mean in:
http://sourceforge.net/tracker/index.php?func=detail&aid=1056914&gro...
Also see:
http://sourceforge.net/tracker/index.php?func=detail&aid=2838176&gro...
Interesting. What I am missing in this patch is a prototype tooltip entries (the symbol). Are there any examples of this? Also what is not clear to me from the patch file itself is whether the tooltip is per-object or per-nlet.
Cheers!
Ico