Hi there.
We definitely have different improvements to the category system on our "to-do" list.
This one sounds to me like you are looking for categories to be more along the same lines as Article Manager (if you are familiar with that).
This is on our list already but I'll add your name to the list of people that would like to see it happen.
That's actually how we decide which new features to work on (how many people it would help).
Let me know if there is anything I can help out with in the meantime :).
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Cheers,
Ross Fairbairn - Consulting
consulting@interactivetools.com
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