Have you ever looked at a forest, and thought "I want that gone", but you didn't have construction bots yet, and manual mining seemed like too much work? Then this is the mod for you!
Just hit alt-c (or whatever you change the keybind to), select the trees to be destroyed, and let your choice of personal laser defense, combat robots, personal weaponry, or just about anything else you can use on biters do the work. Also, area of effect attacks (such as grenades) deal double damage against marked entities, which is totally a feature, and not a bug I couldn't figure out a good way to fix.