I know I'll get rocks chucked at me John, but is it a good idea to fly so many of these HARS aircraft "part time"? Is the cowl flaps issue you have discussed a lack of corporate knowledge? I wonder at the safety of outfits where pilots fly 3 or more types. Do they really know all the limitations and emergency memory items for all the aircraft?? Do they know the AFM for all the aircraft? Interviews I do would suggest otherwise - IFR knowledge and current aircraft knowledge is woeful 19 out of 20 times. Knowledge of the aircraft is vital when things go wrong, and its inexcusable when lack of knowledge is the cause of things going wrong.
Like Centaurus, I question (rather than accuse) why the cowl flaps were operated this way.