I know there are ways to spawn groups of AI with set behavior and waypoints. But I feel that it would be much better and easier to have a feature which allows you to place a unit with a waypoint in the editor and then place a trigger where he would spawn only when it is activated.

I.E:

1. Place AI
2. Give command
3. Add spawn trigger module.

This would simplify many not-so-experienced scripters mission editing lives. It would also boost the missions performances immensly if you plan to have alot of AI.