Hm, now that I actually see a demonstration of this hack from Wayne's site, I acknowledge my previous statements were somewhat over emphasized.
Still, this hack needs to be re-worked in the instructions Wayne provided.
Another good suggestion would to make the shell interface for the subforum manager to look not like the AdminCP. If you made it look more like the forum style, and redesign it, and less of the AdminCP and perhaps even used your own coding (since much of it
looks like copy and paste) then it would have a better chance of being accepted by Jelsoft. Otherwise you are giving unlicensed users a taste of what vBulletin licensed administrators can access.
My last bits of commentary.