I would disagree Ace. The primary function of the TwinSync is to synchronize the engines so that make that perfect harmonic sound. That would be desireable on a 337 as well as other planes. The latest software has a mode 6 now to disable the idling the running engine in the event one dies. This is for planes like the 337 and the Ziroli DC3 (i.e. planes that fly well on one engine).

I do have an idea for controlling mixture. TBD.