Nitemares script has a lot of issuse due to the way it leaves a convo, and the way it detects multiconvos.
I've been working on a script for the same thing for a while, and im just trying to find time to finish the UI then i will release it.
While mine won't be the perfect protocol method that cookie mentioned, it does do a better job of closing the convo (without using .pif), and it doeshave more adjustment options.
Unfortunatly i don't know when it will be done, because i have no free time these days
DT can vouch for the fact that i have been working on this for a while, and havn't just stolen nitemares idea