I should have clarified this earlier, my theory that Cingular had hamstrung the 6682 was very wide of the mark. There was a mention of what was really going on in Matt's comments, and Jouni over at the S60 MRKTNGman blog pointed it out too:

One nice usability trick is to hide features, which are not configured. Send via email option doesn.t appear in S60 Camera or Gallery application, if email is not configured.

So in this case Cingular are not guilty, surprising but true!

Update: Gah, corrections of corrections, Matt points out that on a Cingular branded Nokia 6682 this menu item remains disabled even after an email account has been configured.