Hi Fabio,
I can confirm with 747, all landing gears, flaps, spoilers are correct. But, the other things like ailerons, rudder, Engine status (EPR, N1, EGT etc, also engine sound), and tons of buttons in cockpit like APU switch, exterior lights switches, transponder, Radio, FMC, FCU. PFD and ND are abnormal as well.
As a customer, I know things like PMDG is quite a Giant, but as most of people have experienced FSRecorder, I guess there're lots of assignments are based on general P3D base. So when we finished one assignment, we can use it globally.
We are pleased to know that you are researching the SDK provided by PMDG, but please be quick, thank you.
Pic took from FCR v3.5
PS: oh, the wingflex is also buggy, that's a big eyecandy for us.