I agree with you on the engine setup. However, we don't always have access to an "engine guy". I use glow drivers on my single engine planes for the convenience of not sticking my fingers in the prop and for scale appearance on fully cowled engines. I have seen my friend, who is an experienced twin flyer, stick his finger in the prop while switching the glow driver from one engine to the next. I normally turn it on to start the engine and then turn it off for the flight.

However, as with most of us, I want to take every precaution to prevent an engine flame out. So I am installing the electronic transmitter switchable system on my Cessna 310 such that I can turn it back on for landings. I will attempt to tune the engines as good as posible before flights but if I am off a little, the on-board will help keep them lit.