So whatever the links are in FSX that create icing, according to the FSX lead team, a global programmed moisture content doesn't seem to be the trigger.
Yes, I understand
I inserted that quote simply because you seemed to think that because the dew point was mentioned in the METARS there "should" be a connection to a humidity index.
I think this is where we are failng to communicate: The local dewpoint, contained as it is within an FSX data struct, and accesible via Simconnect IS
what you are referring to as a "humidity index", convertible by a few simple equations into whatever you want it to be, percentage RH, moles-per-liter, whatever is needed. It isn't a matter of what I think "should" be, it is a matter of fact from page 96 of Simconnect interface document. Obviously I realize that any A2A carb Ice model will be complicated, and the general per-station moisture content of the air as it contributes to carb ice in the P-40 is but one factor, but it is there
. As far as default carb ice modelling goes: Whatever Aces did for its default carb ice model for default aircraft, was never going to be used by A2A in any case, humidity or not, so I'm not sure how Aces did it even matters to the P-40, or why it came up in the conversation in the first place.
Anyway, I look forward to carb icing being modelled in the future for this airplane. It would be another nice feature that I think would really round some things out.