The 'Homeroom' Setting label that can be found on this path Core > People Finder (search for a teacher) > Click on Teacher > Click on Schedule Tab displays a Schedule Setting where you can define the 'Homeroom' for the teacher.  This is confusing as many schools have a Homeroom course for the teachers that may or may not be the same as the primary room for which their classes should be scheduled in.  

I would suggest changing this label to read something like 'Primary Room' instead.