Is there any reason for confirmation? They're rarely confirmed and it's just annoying for legitimate posters. Here's a few reasons I don't understand your current setup:
1. Uploading the files still stores it on the server until it's confirmed or denied - it can't be a server space issue.
2. People can link to whatever files on whichever file hosts they want - it can't be a safety issue.
3. People can embed whatever images they want from other file hosts - it can't be a content issue.
What's the deal? I believe we had the virus scan rule removed for the same reason; it's completely redundant. The site already openly allows you to work around the moderators and breaking the rules is the choice of the poster (linking to other sites, etc.) - another important thing I should bring up is that these rules are very rarely broken.
Rather than interfering with the occasional posts that actually use the attachment feature, wouldn't it be a better idea to allow attachments and check for rule-breakers every so often? It seems a bit backward at the moment, and it's clearly not working.
Jadd.