Of course, Canada has so much to offer in this situation because of the role of Canada--respect and leadership--between the north and the south. Canada has no personal ambitions to pursue either in the north or in the south. All they want is to make sure peace is maintained in Sudan as a country. Also, they can actually put more pressure on both parties, NCP and SPLM, to negotiate the outstanding issues faithfully.
Canada also, at one point, went through a referendum in Quebec. They can also share that experience with the people of Sudan to see how this thing can work.