Are you referring to the search results in Limewire with the trash can next to them?

Each LW user determines for him/herself what files to label as junk. You can set the 'junk filter' sensitivity in options...filters...junk. I set it at relaxed, with junk displayed at the bottom.

I think the method that you are using, i.e. labeling files as spam so others know not to download, is okay, but I would question why you are downloading spam in the first place. I rarely download a file that is something other than what I expect...

Music files (in my experience) are almost always what they say...Avoid .wma files (add .wma to keyword filter)

For video files, use bitzi...How to use Bitzi

Download programs at your own risk...Be aware, however, that many will contain viruses (you should have antivirus protection no matter what!) and many will contain freeware/shareware that you can download from a more reputable source.

Here's some more info...

How to find music

Fake files showing up in search results

How to filter porn & spam

Good Luck