How do you get the running calculation for cumulative average? I thought you had to set up a calculation and "run" it every time you wanted info posted?
Do not post your grades until the marking collumn is up! Doing so will hurt the functionality of Netclassroom. Not to mention is a complete pain to continually do on a regular basis. File Semester calculations as a suggestion with support, but do not go around the functionality of the system to gain it. This will only cause frustration with your users, because grades are no longer LIVE.
IMO - because they can see their live grades the students and parents have a good idea on where they are.