Yes my friends,
As I replied to darklord's post, I am totally agree that port of entry officers will check if you are intended to move and live to your final destination or not? It will happen with checking your next flight ticket to your final destination. It can be a ticket with 3 hours later flight or it could be a ticket with two days later flight along with explanation you like to visit a friend in Toronto and you like to stay couple of days with them and then move to your final destination.
Let's take a closer look at port of entry procedures:
When you want to fly from your home country to Regina/Saskatoon, there isn't direct flight to those destinations.
You need to buy a ticket from your city to Toronto and another domestic flight ticket(Air Canada or Westjet) from Toronto to Rigina/Saskatoon.
When you arrive to Toronto, you will go to passport control section and then they will forward you to immigration section.
At Immigration section, they will check your visa and CoPR documents and maybe they want to check your money and other things like your next flight ticket to your destination.
After that they will say welcome! and let you in to Canada as a permanent resident.
After that you have to go to baggage claim belts and you have to receive your luggage there.
After that you need to meet custom officers and declare your items.
After that you are in exit section of Toronto airport and you are free to go out! There won't be any other check for you or there won't be any other forces to guide you to domestic flight terminal (Like bodyguards! :-\)! you can go out to Toronto!!!
BUT when you have a Rigina/Saskatoon ticket in your hand:
You will go to Domestic flight terminal.
You will check-in like other passengers who arrived there from other destinations or even they came from their homes from Toronto.
They will receive your luggage and give you your flight boarding pass. (There is one consideration here, when you fly from other international destinations to USA or Canada, you have to bring two 23Kg suitcases for every passenger but when you want to travel inside USA or Canada from one city to other one, you need to have one 30Kg suitcase for every passenger! It means if you have 4x23kg for two person, what will happen in your domestic flight from Toronto to Regina/Saskatoon?! Do you have to pay fine?! :-\)
You have to go through security checks and there won't be any other passport control because you are inside Canada now.
You will go to your gate and fly to your destination.
At Regina/Saskatoon, there won't be any other passport control because you arrived from a domestic flight.
That's it, When you passed, port of entry immigration officer at Toronto airport, Nobody can force you to go to the domestic terminal section and you can do what you like!
Bear in mind, When you received your permanent visa through a PNP program, you are not a prisoner. You are a permanent resident of Canada and you don't have to stay all your life inside that province without living it!. You can TRAVEL to other provinces and STAY temporarily there to visit friends, BUT you should live, work and pay your taxes inside the province, which nominated you.
Good Luck.