I know what you mean it sucks, but if you put in words or names in the filter you'll never get them so put what you know you'll never download, and you will not have to keep changing your filter.
though the option of searching for tittle and artist is a pretty good idea that I think the nest limewire should have.
other than that I think you'll just have to live with the problem, cause I don't think that there are any other solutions than the ones mentioned in this forum