I don't think the first figure is altitude- ship waypoints have the same numbers in this place.
The first 0 changes if you put a time out on the waypoint- but not in an obvious way
The 'speed' parameter at end also can change when you put in a time out. Seems to have some effect on speed of vehicle but.....
The 2 figure- seems to have something to do with behaviour type?, vehicles on splines usually use 6, convoys I see numbers in 30's quite often
Yeah, another of those tantalizing hints that something is going on 'under the hood' (but is possibly only partially working)