Having flown the first DHC-6 on the west coast (1966) and thereafter worked for a company that had thirty eight of 'em at one time, not once were the fuel levers mistaken for the propellor controls.
Totally different shape.
Now, if you actually look at what control you are moving, instead of just grabbing a handful, it works much better.
And yes, I've flown the machine single pilot too.