About runway 24 not having an ILS: indeed that is strange. From my own observation the dominant wind from the West almost always becomes from the East in bad weather in Quebec City. I guess that's why they put the ILS on 06 first. I wonder if the ATC had not been privatised they would have a second ILS by now. The article says Nav Canada asked the airlines and they said they didn't need it.
About circling: I have heard/seen that only once in CYQB, from a CE pilot in fact, last summer. They did ILS 06 circling to 12. Didn't know one could circle all the way to 24. (I'm just a spotter.) The Jazz pilots requested "Contact" approaches to 06 that day.