oh, ok. sorry actually I should have mentioned I am talking in context of parallel runway use, lengths being greater than 10000ft. The issue is fsx assigns arrival runway based on direction aircraft comes from, because of this at some airports arrivals become crowded onto one runway while the other stays vacant. So I was thinking of distributing the load by way of injecting runway assignment with an external application.
So does that mean it is not possible to modify runway assigned by the atc to arrival traffic via some offset? I mean I do see a variable for that represented in aiseparation and traffictoolbox, I was thinking of somehow injecting a value to that before atc assigns one.
Or if there is any other workaround to the traffic distribution problem on parallel runways, would really like to know.