Yes, that is possible. I don't think there are pre-made hardware functions for this, but I can make it if you want.

I'm not really sure what you mean, but Air Manager claims focus. That was done in favor of MSFS. With version 4.2 you will be able to choose if you want the panel to take focus or not.

It is easier to add another Arduino, they're not that expensive.

I think it might be possible in theory, but a bit cumbersome. You would have to plug USB cables out and in to make sure that each uses the correct Knobster. You would have to do that each time you use it.

You can check the bus voltage in the Viewer in the Settings tab.

It does not use X-Plane commands, so that isn't possible, sorry.

I'm not sure what you mean. But always make sure that it is .png and not .PNG for example.

Use the pre made hardware function?

That would be an almost climate neutral way to travel. Maybe by sailboat
I still dream about taking a freighter to the US with my family some day. But that takes a couple of weeks and certainly isn't cheap.

There's nothing for PMDG. See the FAQ why:
https://siminnovations.com/wiki/index.p ... G_aircraft?

We're working on a full 737-800 set, which is also going to be compatible with PMDG in MSFS. But only in combination with pop-outs. Maybe streaming one day...