There are no additional settings on 3.1.8 , this is all based upon the threat database. We would need specific examples to determine if we need to add additional signatures or update existing ones. The file blocking profile in 4.0 has a new action called continue, which can be used to deliver a comfort page when users attempt to download an executable file. The page prompts the user to click continue on the comfort page prior to downloading an executable file. Verbiage on the comfort page will alert the user of the executable file and if they haven't specifically requested the page, they should not continue, but click Back. This is an effective way to stop drive-by downloads.
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