In Red Alert 1 AI can be simple edited in Rules.ini ... OpenRA needs STANDARDS for all modding/scripting/mapping. Even now there is a tons of incompatibility between versions, pile of bugs, e.t.c.
You can adapt the HackyAI at mods/ra/rules/system.yaml at the moment with very limited functionality. The UnitsToBuild percentage is simply ignored. However Valkirie is working on a new BetaAI which is much more customizable and clever Have a look at http://www.sleipnirstuff.com/forum/view ... 82&t=15984
