Not a DC3 or Mosquito pilot, but if having been a Canberra pilot qualifies me to answer questions on Asymmetric (Canberra pilots can always spell it right!) here's mine.
This question always used to come up, from ATC folk wanting to be helpful. We always told them not to worry. Provided the aircraft has sufficient speed, and is starting from wings level, the turn either way is equally easy. Reversing a turn away from the live engine into a turn towards the live engine is a bit more difficult, but only in that it is slow reacting.
I understood from the 'ancients' that the question dates back to the old, powerful, wartime twin pistons where propellor torque was an additional complicating factor. I believe this was the reason why they requested no turns towards the dead one. It would have been too easy to overbank and lose it.