Yes, that's it. :up:
Now it works excellent. I merged both options (for including and excluding), removed your debugging info (appeared on top of page in excluding forums), removed option for including all forums in excluding part and I hope that everything will work as intended.
I tested it on my server and now everything works as far as I can tell. I had strange bug, but really strange bug when sometimes excluding forums became including ones after reinstall and where reinstalling product again helped.

I'm not sure why, but I changed plugin execution order for excluding forums plugins to 6 and tried 3 times to reinstall mod and it worked all 3 times fine. If someone would have problems, just try to reinstall.
I attached modified version and BirdOPrey5 I hope you'll to use it too (and support it).

This is really excellent mod. :up:
Only suggestion is if names of forums in threadbit could become links to these forums? This may be very useful, especially if users would like to open new threads in appropriate forums.