Add a new "GARRISON" in the editor that makes an AI group occupy the building positions and hold position.This would be useful for setting up defenses. Also allow players to open up the spacebar menu and point at a building and click on "Garrison" to quickly order troops to occupy a building. also have an "Assault" command that makes AI units move from position to position and when the AI have been to all the positions then they will go into a "Garrison" mode.