I have 3 things in mind
1. Agree that weather should have effect on planes...maybe pilots take it on themselves to ask for course change, or some such.
2. Apply more specific speeds to each type of plane...Cessna/Piper/Cheokee type single props (50 - 140 mph) compared to 150+ for heavies...and whatever Lears and Cessna jets have.
3. When changeing altitude, the "foward" movement maybe should be reduced some percentage/factor.
Just some thoughts...