This was some code written into WeBWorK whose purpose was to restrict access to section data to only certain Profs and TA's. However I don't think that code was ever tested (except by maybe one person) and it certainly hasn't been maintained. At this point it's dormant code lingering in the system.
Probably the best thing to do is not to give TA's (or instructors) any more privileges than they require to do what you want them to do. If that's not sufficient for your purposes, then you probably should consider running each section as a separate course. If separate sections have different due dates, etc that would probably be the way to go.