You can plan the runway all you want, but it's up to ATC what runway they will give you. If you have any weather turned on at all, that will be the main decider of what runway ATC will give you. If you are using real weather, check the reports at the airport you are flying too to fine out which way the wind is blowing, then you can plan on the runway from there, but even so, that still may change by the time you get there. Another thing I've found, if the airport has only one runway and you don't have the weather running, ATC will set you up on the Primary runway, which at most airports in the most north to east runway. Another thing I've found is if the runway has ILS, it tends to lean towards that end of the runway, if the runway only has one end that has ILS that is.
You can always land on the runway and ignore the ATC though, there isn't any ATC police in the game!!!!! :)
