Press 'g' for smooth group movement, or 'g' again for individual pathfinding. Grouped Unit Movement will be useful in any RTS that hopes to have the units
Thanks to heehee341 for his excellent description of how collision detection works! This isn't perfect, but it is functional. It works by having each unit detect whether it has reached the desired point. If the answer is yes, it changes its status to still. From then on, each unit that "collides" with another unit checks to see if it that unit is "still." If the answer is yes, the moving unit also switches to "still," as it becomes very likely that it is in the correct "general location."