I’ve been playing around with the new InputEvents APIs and it’s great to finally have access to them via SimConnect. I’ve been able to enumerate all the events, send updates, receive updates, and even listen for changes.
Unfortunately while a lot was exposed there are gaps that make the current implementation challenging for real world use. Specifically, it appears that EnumerateInputEvents only returns the equivalent of the “SET” events shown in the sim’s behaviour dialog. There doesn’t seem to be a way to access _INC, _DEC, _TOGGLE, _ON, and _OFF.
For example, this is what is available for the C172’s autopilot NAV button in the sim’s behaviour dialog:
And the button itself in the SIM simply triggers (>B:AS1000_PFD_1_NAV_Mode_Toggle). The InputEvent APIs don’t enable this same simplicity via SimConnect. Instead we have to fall back to old tricks: read the current state, invert it, and write it back.
Please consider exposing more than just SET via these APIs. Thank you 
(@LorbySI you’re probably interested in this as well)