On Wednesday, April 8, 2015 at 5:00:06 PM UTC-4, Jonathon May wrote:

But is it worth deploying the turbo but not starting it ,because with the
brakes out and gear down and turbo up the drag will be enormous,it may
even to keep you below VNE.
However you would want to know what the spin characteristics are in that
configuration.
Any thoughts?
Jon

What does the maker of your plane say about doing aerobatics (a spin for instance) with the engine boom deployed? The centrifugal force about the axis of the fuselage might be a factor.