How to set AI's "smartness" in Editor?

Hey folks!

I've been trying to fidget around with the SC II Galaxy editor, and I've hit a bit of a wall. I'm trying to make a computer opponent, and have it use a high level AI, something similar to the "Insane" AI used in single player melee games. The problem is, the editor only seems to use "Set AI", and the difficulty of that AI player cannot be modified. Essentially, I can only add medium difficulty level AI opponents. I've tried raising APM, but that's made no noticable difference. Any help on this would be appreciated!