My friend and I have been doing the typical battle here and there and we are getting a bit tired of the easy 2 vs. 2 match, but don't like spending too much time on a 2 vs. 3 match. When playing against 2 computers, the AI sucks about 9/10 times. Zerg will finish their 2nd extractor and then just stop continuing. Terran won't build air units. Protoss won't do air units as well. But when playing against 3 computers, usually one of every race, they are all going very hard at it. We don't mind going against 3 people, but sometimes we don't want to. Is there any way to increase the AI of all races when playing against 2 people on Battle.net?

Use UMS/triggers to give them extra resources or free units or something?

You can also use mods, but those don't work on Bnet unless everyone has the mod and is running it.

Since its just you and your buddy playing against the computers, You should Try getting some Ai Mods from here,
http://www.broodwarai.com/index.php?page=ai
Best Site for Custom AI, You can both play on Bnet with each other and the computers, but you will need to both use the mod.

I personally reccomend these 3,

Ashara Ai Hv1.11, Racine no$ 1.0 , Zelduck Ai v0.3 ,
Or if your interested, there is some nice tutorials, and tools to help you make your own! And you can make your Ai that you play with your buddy just how you want it to be, And nothing more or less! ^-^.

If you're really tired of just winning, maybe you should just try against people.

Play a game with a computer and save a replay. Check the computer's resources. You'll discover they have plenty.

It's not that I'm tired of just winning. I'm tired of having to go against 3 computers to get the AI level I want, but I only want 2 of them half of the time.

look at keirebu's post

Josh was last active April 28th. I do not believe your direction is going to help him because I doubt that Josh somehow managed to completely overlook the post. That factored in with Josh's last active date makes the revival of this topic unwarranted.