Please understand the Alpha mission editor has been re-worked over and the video I have in the sticky thread does not apply to this version...
use the Q,W,E,A,S,D,Z,X,C keys to move and zoom around the map. And make good use of the "view selected" button on the bottom right of the editor while highlighting waypoints to speed things up.
AI pilots are possess one skill level. However you can reduce the damage guns can do by editing the arena settings. But that would also reduce your gun damage as well.
When the Alpha goes into Beta, I will produce a new editor tutorial. For now, look for bugs and other stuff. Report anything or ask questions in the Alpha forum.