In very a class which has thousands of students its difficult for teacher to check all assignments and answer all questions of students in forums or in a group. For this sitution teachers need some helper to help him which i called class moniters. Now a days a very students help his teacher free of cost so that's why if teacher offer tham amount than moniters will help teacher to improve his course reveiws and help other student.
I suggest add this type of feature in WPLMS . as in my case in my class there is 500+ students and i am facing very diculties to dealing with every one and most of peoples have facing the same thing as i am.
I have request another feature also about 6 months ago to add live chat in WPLMS but it still not available :( .