I assume you mean control point attack/defend? ABS has good prefab that makes it easy technically. If you mean layout wise, a/d maps that have 2 control points, usually have a choke between the points to prevent defenders from regaining the area of first control point. On the other hand, control point map like Steel is a lot harder to make. You need quite lot planning to make it work (fun to play and balanced) but the game logic is as easy as for 2cp