Setting it to busy used ot work for me, but not anymore.
Here is a link to a msn patch. One of the options is to take off the nudge restriction. Oh and read what section your in, because one part patches the main window, the other patches the options of the conversation window.
Lol, you probably saw my specs in the "HILARIOUS SPECS!!!" thread i started, i cant have more than 3 or 4 msn convos at once...imagine nudge wars...lol.