I did find one problem with doing this. Because of the cache files, new messages in the "shared" category won't always register in the forum summary. I got around this by hacking ubb_forum_summary.cgi and disabled caching of forum summaries. I didn't delete the lines of code. I just commented them out like this (although you could delete the whole bit of code if you wanted):
[code][/code]So far everything seems to be working fine. I am now just dealing with the different templates and trying to change the shared forum templates based on which category forum summary that they came from. This is proving to be much more difficult.