We already have a script that automates this for us, but having implemented in the site itself would be much better for everyone.
I really like this. Although it probably wouldn't be perfect(since I often define those missing functions in some of my scripts and that wouldn't be noticed), it would still be a huge help.
Userscripts.org should stand alone and be independent. Reliance on an outside party is just a bad idea, even if it was just to augment features Userscripts.org lacks.
I'd be much more interested in a general way to allow one script to have multiple authors(perhaps through the groups system already in place). I'm not sure if that's exactly what you are suggesting here, but I'll vote for it.
This should be closed since it is neither practical or possible.
I'd still rather have this in the site since then everyone can use anchors without first having to install a script.