Strictly speaking, it is unconstitutional!
it is like parliament is telling judiciary how to form benches and how to proceed against those judges who give ruling like "...if Musharaf is dead, bring his body back to Pakistan and hang in public on D-Chowk for xxxx days".
Parliament cant. Similarly SC cant tell Parliament how to conduct their business. And funny thing is that at the end of this ruling they have written "Not approved for reporting" in bold letters. It means this decision can not be cited in any future cases.