Easier for the company in regards to training, maintenance and spare parts as you only use one type of aircraft.
17KTS
The engine will flood with fuel.
If you pitch up in a Seneca the speed IAS will decrease, because of the constand speed drive (in the propeller hub).
The propellers want to maintain the original RPM. Therefore the blades will go to a more fine blade setting.
Live side to oppose the yawing moment.
No, you mechanically change a valve that changes the air intake to air that runs past the exhaust manifold and is therefore heated.
Yes, feathering locks engage at 800 RPM on the Seneca.
We feather to stop windmilling and reduce drag.