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Some modules can be a pain and some are easy. Wouldn't you be needing a lot of clones? That isn't practical. Some modules can be a pain and some are easy. What you can do is make the categories like they should be used and then create static links directly to the various categories.
so:
<a href="$xoops_url/modules/mydownloads/viewcat.php?cid=11"> Joe Documents</a>
<a href="$xoops_url/modules/mydownloads/viewcat.php?cid=5"> Mary Documents</a>
etc.
You can create a custom block with a whole menu of these links, shove them into the main menu, link bar elsewhere on the site, etc.
After setting up the downloads you can view and copy the cid needed for the link.