I think the bar is a very good idea! When we want to talk about every other thing other than arranger keyboard we can come here.

If OT was on every topic that was not about arranger keyboard, then I suppose OT in the arranger forum could be tolerated since once you see OT you can disregard if you just want to read about arrangers. But is seems as if that was not the case all the time, so I think this is the best solution. It gives the Administrator less work by trying to police unmarked and sometimes unnecessary OT threads in the arranger sections.