i'm not too concerned with a reason for being blocked but I would definitely liked to be alerted to it as soon as it happens. it's only fair to have a choice of blocking their ass back or leaving it alone. I wouldn't bother with disputing it either, to me those who have me blocked are dead to me anyway, so eff them.
that would be very effective on cracking down on trolls and offensive people. I personally don't mind,if they added it would be very effective. I don't know if I would use it, I don't block people because I don't see a reason to do so.