First you add a digital output. Then you can set the state of this output with data from the simulator. Let me know if you need an example.

Shouldn't the image move with the throttle position? You cannot make it nil afterwards. To hide an image, slider, etc, you use 'visible'. bla = true visible(my_image, bla) visible(my_slider, not bla) Note that when you make a slider invisible, or any input for that matter, you can no longer control ...

In a future version we might add auto enable.

Did you read the user manual?
https://siminnovations.com/wiki/index.php/Knobster

Haha you can model that I guess, with a timer and the gauge being a button. We're working on the 737, which is a huge task which needs to be finished first. We're not sure what's after that.

Did you update to the latest version of Air Player? Because that works fine here.

That would just be 1 - slider_pos

Opacity?
https://siminnovations.com/wiki/index.php/Opacity

It's indeed something we still have to debug. It only happens on some systems. You can install the X-Plane 11 plugin, but you will loose streaming.

Note that a switch has a pressed and released callback, just as a button. That's what you will need to use.