I have done this for the files I tried downloading and found to be clean, but my searches are coming up with ~30 results marked as junk and maybe two or three as non-junk. In practice I am only going to download a single file from the list. I can mark that file as non-junk but the first problem with this is I am having to choose from the files marked as junk (which somewhat defeats the point of having a junk filter) and hope it was one of the incorrectly marked files and not a virus.

Secondly, if these files being incorrectly tagged is a result of spammers deliberately tagging them wrong, then I would imagine they would not just mark the file once. They'd do it a couple of hundred times from different computers/proxies meaning that their tagging of the file would greatly outweigh mine and it would remain marked as junk.

I don't yet have the technical ability to help alter the algorithm, maybe once I have started my uni course I'll come back and see what I can do. At the moment I am just asking if anyone else has noticed the problem and if it's being worked on.