Yes, these "hanging" switch activations are somehow common but not a special Captain Sim problem in my eyes.

As for the other problem with the generators, I must say that I don't have this cfg line edited and get sufficient electrical power from the engines so far.
It just takes a second after APU shutdown and maybe a slightly higher idle power to let the engine generators "pop in" and the generator lights to come off. Switch positions should of course allow a feeding from the engines.

With that edited line you advise the model to always have ground power like feeding. I would agree on seeing this as a bug but as I said, for me it's not necessary as the generators are working.