Someone else can probably answer the question much better than I can. AFAIK Stealth mode is simply placing the computer into a mode where nobody can discover it except via excepted firewall programs; ie: the computer does not respond to the many pings that may come from various sources including hackers & such.

I run Mac OSX & Stealth is turned on when firewall is running. It does not affect LW or Azureus.

Perhaps that does not exactly answer your question, not sure.