Is there a way (or mod) to prevent a link submition to certain categories? Will these categories that don't accept links also been hidden in the dropdown menu on the Add url form?

Thanks for mointing me in the right direction.

There is a very popular mod that does that... you might be able to find it, along with many others, in the Resource Center of this site.

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The Immuatable Order of Modding
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1. Read the FAQ, 2. Search the board, 2a. Search the board again, 3. ask the question, 4. back-up, 5. experiment, 6. rephrase question (or better yet, post solution to original question)