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Finally released my PostApproval plugin to the Addons page here at vanillaforums.org, I was waiting until I could figure out how to make it work without manual changes to the core code, and the solution was a lot easier than I thought. The plugin includes the modified files for the comments, discussions, and vanillasearch models. It's not the greatest solution but at least it works and shouldn't permanently bork your forums if something goes wrong.
Let me know how it performs and if you notice any glaring bugs. I've released it as a beta for now as I didn't have time to do a lot of testing.