Not possible with the mission builder. You have to open the mission xml file and setup the first waypoint with the following parameters:
Type="turn"
Speed="0"
Alt="0.00"
The most diffucult thing is to setup the Lat-Lon accurately. Personnaly, I use to ride around an airfield with a vehicule and when I'm at the location I want the aircraft to be in the mission I'm building, I just note Lat-Lon values by pressing 'z'.
Hi LZ
Yeah, but have you already remarked how imprecise Lat/Lon can be using "z" or whatever other resource? Sometimes I have to spend many hours trying the best location for a facility with the MB. And the taxi or runaway lights, then? A true Job's work!! (Or Job's job?)