I'm not sure how having to spend time walking six miles a day is supposed to give the kid more time for his studies... I really just don't get that one at all. But, I guess the upside is that he'll still be in shape if he gets track back??
Door wise, only time I've taken my son's door off the hinges was when he slammed it... lost it for a week... but then, he was only 8 or so, not near as weird as doing that to an older kid... I can't imagine having to wait to use the bathroom just so I can change clothes without anyone seeing my 2000 parts... that's just humiliating and I've never been one for humiliation as punishment.
I know all about the unfairness between sibs... I got a C and I was grounded six weeks... Sis brings home an F and not so much as phone time taken... parents can be weird that way so I am trying, now that I am one, to be fair between ours... that's really all you can do... if you see something you don't agree with, then don't do it yourself.