Well, the problem with a "Move" waypoint on top of the chopper is that AI understands it as a place to be reached BY FLYING (since it is a chopper). The only way that I can think of right now is to write a script like this :
dostop mychopper
~60
mychopper domove getwppos [mychopper, x]
exit
( where x is the number of the waypoint of that chopper...)
If you're not a scripter yet, let me know, there's a tedious way with triggers that will use the same commands.
When I wrote this, the real armstrong's solution was not uploaded yet...