Maybe the second question should be answered by the Canadian Bar Association, because it was actually they who were talking about this issue, not I.
In terms of the first question, about the provisions of the Optional Protocol to the Convention on the Rights of the Child, I can refer you to article 6(3) and also article 7(1). Article 6(3) states, in part, that “States Parties shall take all feasible measures to ensure that persons within their jurisdiction” are given “appropriate assistance for their physical and psychological recovery and their social reintegration.” Article 7(1) says that “States Parties shall cooperate” in the “rehabilitation and social reintegration of persons who are victims of acts contrary thereto”--meaning the protocol--“including through technical cooperation and financial assistance.”
So basically what it does is require Canada to cooperate with the United States in dealing with Khadr in terms of his rehabilitation and reintegration.