Questions,
If your son is in fact doing this course at home and in school sits in regular LA class, I would fight, fight,fight.
Believe me that it is much easier to do what you are doing when the child is young, since they generally have more free time after school. Comes middle school or HS it will be very difficult to have them do things like that at home.
I know that in the school my kids are going to, they would be allowed to work on the computer on their own during class time AS LONG AS THE COURSE THEY ARE WORKING ON ALIGNS WITH STATE CURRICULUM.
