The centre only passes IFR traffic to arriving or departing aircraft within 10 minutes (more or less...). There is no coordination between the controller and the CAGRO. They are simply following their respective mandates, hence why you might receive duplicated traffic (but the CAGRO does monitor the centre frequency).
If Skywest & Airnorth (plus the remainding QFA and DJ jets, and local IFR operators - coastwatch, Skippers etc...) actually invested and bought some bloody ADSB IN/OUT kits with their shiny new jets, and then if Airservices maybe "subsidised" some kits for the VFRies, yours and the controller's situational awareness in the circuit area would be 1000% improved. Perhaps the "airspace" would not have to be changed at all...
Given that centre controllers can now, for example, "see" the RFDS guys on their screens (fitted with donated ADSB kits from ASA) backtracking on the YBRM runway, and then which direction turn they take along the taxiway, the surveillance resolution is potentially 5 times better than radar.
The ADSB ground gear is all installed and waiting to go... Flick a switch and suddenly you get a significantly enhanced radar service in the middle of the boonies... Whether the airspace users choose to use it for the benefit of inceased safety is up to the them and the regulator...
