Edit: I 'edited' your tag, and just re-submitted it with no changes, and now your profile seems to have picked it up. See if you can find the edit button next to it now to fix it up. Looks like this:
Those are all good points, RichUK!
At least I can edit my tag info by pressing the little 'edit' button right of the tag name - but this might be an admin-only thing, in which case it should probably be changed so that users can edit their own tags, just as you suggested.
A link to the tags section from the Addons Depot would obviously be good too, d'oh.
Your profile should automatically have a list of your tags - at least mine does? Then again, it's possible your tag comes from an older version of the tag system and it's not properly synched to your forum profile or somesuch. I...don't really know how all of this works. This might also be a reason why you can't edit your own tag, if the forum doesn't recognize you.
That's really the thing with all of this right now; @kju as well; we've got an idea for how to let you re-register a tag, but we're going to have to work on the mechanics behind it for a while, so please be patient. But we'll definitely get 'er done. One way or another.