08-29-2021, 11:20 PM
Yes, MSFS added HVARS to the mix. LVARS and HVARS can be read. FSUIPC lists them and although it's been a while since I've been in the P3D or FSX SDK I believe you can get them from there and manipulate them. That's what addons like Air Manager and others do - they have an interface (dll probably) to get the values or write them.