I don't use Randomizer but in PF3 if you designate a waypoint as end-of-SID, this activates SID mode and you will not be given an initial heading or vectors, even if the SID box is unticked.No just SID name. LPPT airport and IDBID Sid.the fist point of flight plan is end of sid which was idbid. In PF3, waypoint I had marked that as end of Sid. On sid star page, if sid box was unticked then I should have been given either runway heading for take off or some other heading and not sid departure.
User Guide p. 79:
Quote: However, using the Set END of SID/DP button you can select any waypoint in your flight plan to mark the end of your published departure. If you use this feature PF3 will use the same altitude you may have set in the SID/STAR page and will also turn on the global SID Active option if it is currently off.