The secondary database is only available when there is more than one nav database to choose from, i.e. when custom nav data has been installed into X-Plane’s Custom Data directory, for example from Navigraph or Aerosoft.
Can’t tell unfortunately, X-Plane just crashed on its own.
P.S. You should remove XSquawkBox plugin, it doesn’t work on Vatsim anymore, and then you Log.txt won’t be so massive.
Payload whether set by FBO or XP W&B should be saved with state, yes. You can use sensed fuel if you like (by clearing the field), but fuel has to come from the fuel truck no matter what.
You just have to sync up the physical throttle levers with the virtual cockpit ones to regain control after ATS is disconnected, the throttle overlay is an aid for this, alternatively sweep the physical levers to full forward and then back to idle.
I suspect it will interfere with the custom camera control in the Challenger, also it’s been reported as the cause of a multitude crashes to desktop. As it’s an unmaintained/abandonware product I would avoid it if I was you.
If you’re on radar vectors/heading (HDG) mode, it’s either required or encouraged, not sure which.
But when on FMS navigation then under normal circumstances the system will take care of it for you, as @Graeme_77 has described.
I don’t think they’ll help as it has to detect an online network connection to disable the feature. It would be better for P2ATC to understand that temperature affects altimetry. Especially as this feature will be built into the simulator when version 12 is released.