For UMS map: I have tried custom AI script and campaign insane AI script. It seems that the AI just keeps on attacking. After a few hours, they still have enough ore and gas, but they won't attack that frequently anymore. When I invade their bases, there usually isn't much of a defense. They won't try to stop the attack using large forces or anything, just a few units.
Is there any way to improve the defense for AI? Maybe another script, or another way of setting up resources, or anything else?
So what I want is the computer AI to keep defending more than attacking.
The campaign AI scripts will always become weaker over time. "They are meant to be defeated". You could try all the additional AI scripts available in SCMD2, SF and SCXE, some of them should keep on defending for quite a while.
The Custom AI will not become weaker, but it will focus on attacking.
Btw, this page is about melee, not UMS mapping ;) Once it is back up, check out Staredit.net, or Maplantis.org (porting from windows to unix right now, so not perfectly available as well), or of course Blizzforums.com!