Now back to extended version.... feel free to implement it or. I just post ideas that might have nice value to moders.
In "UFO Trajectories" there are waypoints defined as [zone, altitude, speed]
Altitude means:
0 - Ground
1 - Very Low
2 - Low
3 - High
4 - Very High
Would be nice to have also
-1 - Force crash of UFO just like it was shot down, as this might be useful. Something similar was implemented in Ufo Extender i think... force some Scouts to crash randomly.
5 - leave Earth orbit and ends this mission without score for alien. I mean not just this UFO but all future UFOs from this mission.
Would be nice to have also one more parameter [zone, altitude, speed, chanceToSkip] with default value of 0. For example harvest mission could land once, twice or never. That would enhance player experience even in vanilla game.