Andrew,
Just wanted to say thanks again for such a great hack with so much versatility. It's much appreciated.
Ok, so I had a question now that I've complimented you.
I noticed today that there is no variable set to disallow selection of what category a new link will be placed in.
For example, if users want to add a link it's required they be in a category that accepts links. However, if they go into a category that accepts links, they can then select any available category, even if it's closed. Not only is that a fairly large bug/problem, but I was also thinking that there should be a variable to disallow_cat_selection, where if you set it to yes, then whatever category the user is in, is the category that's getting the link. If it's set to no, then the user would get the edit box that they currently get with all the categories, however, the categories that are closed would be omitted from the list.
So I guess this isn't a question so much as a bug report and feature request.