Flight plan runway selection issue when loading a *.pln file

Hi, please make it possible to select runway, departure and approach procedures without reseting the whole plan.
I use LittleNavMap a lot, and it is apparently not possible to store departure and arrival runways on these plans in order to export them to MSFS. After importing the flight plan from LittleNavMap to MSFS, departure and arrival runways gets automatically selected. The problem is that when i try to select different runways (or start position), MSFS changes the flight plan completely, forcing me to load the flight plan again from the *.pln file and thus losing the selected runways i wanted at first. This makes it impossible to load a flight plan AND choose the runways i prefer.