They should have never added that functionality in LimeWire. The media player you normally use will offer a lot better functionality, including the ability to queue songs you've just downloaded, tag them, and put them in your proper song library.
A good program will do one thing, and do it well. LimeWire is designed to search for and download files. It does that well. The silly added on MP3 player thingy feels out of place in LimeWire. LimeWire isn't even solely about downloading MP3's.
When it's there, and enabled by default (as it is), people will start complaining about it and adding feature requests. LimeWire should just farm out to the default media player by default and complaints like this wouldn't even exist.