Yeah, this would be great. I believe the best that can be done at the moment is to allow the weather to be selectable by the user, and let them change on a leg-by-leg basis. If you set the weather (like the time of day), it remains the same for all legs of the trip.
There are lots available over on flightsim dot to. If you navigate to Third Party -> Bush Trips. They are of variable quality, some are merely flight plans, but there are several that are rescue missions and the like, and several that add a lot of detail about the areas you are passing through, tell an occasional yarn etc.