At the same time, I have also urged both PMDG and EZCA, but an agreement must be found and something must be done, because it's quite ridicolous that each of the 3 players passes the ball to the others...
Which "3 players" ?
Do you mean you only have the problem if EZDOK camera is enabled ? If yes, there's just one player, and it's clearly EZDOK, since the shaking you see is caused by some kind of special EZDOK effect, assuming you don't have it if you turn it off.
Or, do you mean you only have the problem with the PMDG, with the presence of EZDOK is irrelevant, and it doesn't happen with another airplane ? If yes, there's just one player, and it's clearly PMDG, since the shaking you see is caused by some special effect in the airplane.
As explained so many times on the forum, what you see is nothing we do from GSX, there's just nothing in the GSX code that makes the airplane or the view shake so, either it's a camera effect, or it's an airplane own effect. What GSX does, is simply write to the standard variables for the rudder the value of the steering, which allows the front wheel to steer together with the towbar, which clearly works for each and every other airplane out there, and it would be very unrealistic and bad looking if it didn't.
It's possible the airplane or any other 3rd party addon added any kind of custom simulation of something, and that might be confused and SHOULD be turned off when the rudder is moved by somebody else ( a Pushback in this case ), that's why we have a fully documented way for 3rd party developers to KNOW if GSX is pushing, so they can momentarily stop whatever simulation or effect they are doing, and this has been available for a while.
So, regardless if either the camera or the airplane are causing the shaking when GSX is pushing, they have all the tools and the information to fix the problem themselves. We, instead, simply CANNOT do anything from our side, and it's generally wrong if we tried to hack into a custom simulation of another product, we ONLY use 100% officially documented SDK access and variables, and stopped hacking into the sim long ago, since at least in P3D is no longer required.
Some developers, like FS Labs, Leonardo, Aerosoft, have all used one of these interfaces to be sure their users won't have any problems when using GSX. PMDG once promised to do that as well, but never came out with anything. Assuming, of course, the issue is in the airplane and not the EZDOK camera, which is not clear.
