I was thinking about fitting a turbo timer to Blue, but reading Alexander G. Bell changed my mind, big time. My thoughts on top of Bell's:
Let's agree that the worst thing you can do with a turbo (apart, maybe, from running it without air filtration) is to shut it off immediately after it has done some serious work. No oil flow = carbonised oil on the bearing surfaces.
But given that oil pressure in a Cinq with a hot engine is around .7 bar at idle, is letting it idle much better? The only thing that's keeping the bearings from frying is oil flow. Better surely to run the engine at around 2,000 rpm (steady throttle, no blipping) for a minute or so before going on to the idle routine.
In normal running, you're not going to be using massive boost immediately before you pull up, so idle alone should be OK. Problem with timers is that they can prevent you thinking about what you were doing to the engine.