Great idea just has to be suggested and accepted by the manufacturers who provide the platforms we use. If everyone wrote their software manufacturer and suggested it I am sure they would program the filter/feature in. Any success takes constant feedback, whether to the manufacturer to improve the product, or through forums such as this or independent sources like Bitzi. What would be really nice is if some of these lonely people would grow up someday and do something productive instead.

Limewire has basically become totally useless to download music due to fake files. Total waste of time. Are there any out there that are still worth using?

The problem is not LW itself, it's the people offering files to share on the Gnutella Network (or better to say, the music industry, etc....).
Whatever client you'll use (P2P Gnutella Network client), you'll find the same faked files. But with using the file filters and the "Look up with Bitzi" function you will gradually reduce the amount of faked files showing up in your search results.
How to use Bitzi

How to use keyword filter

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"Never Argue With An Idiot. They Will Drag You Down To Their Level, Then Beat You With Experience"

No you are right it isn't just Limewire, but the days of downloading lots of music are over. It's just too much of a pain. The rich have won yet again....