3.7 will feature this as standard, a stable release is expected within a week or two. If you add modifications you might not be able to transfer over existing comments to the new 3.7 feature, furthermore the 3.7 system will be fully supported by vBulletin.com so you won't need to worry about it going haywire and then the author becoming active leaving you with a broken system.
Basically my advice is to just sit tight for a few weeks and get 3.7 when it comes out.
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