FSXA Mission realtime/historical weather

As far as I can read from posts here, the FSX Mission system can use realtime online weather.

Will it also be possible to use a 3rd party program like OpusFSX to generate realtime and even historical weather (Opus option) in missions?

Opus is default set up using FSX weather theme, and I guess if Opus is not started, the same mission will just show the chosen weather theme?