Group Items in a shot as one unit

Most encoders have an option to group items so the items then become one unit and then that unit will resize and move as one unit.  This is very helpful in many ways but one example is if you have a live stream and you want to set it off more than a drop shadow you could then add a graphic or a solid color or whatever you need as a background for the live stream. Then you could group the two units (live stream and background) and they would become one unit and when you resize the group both units would resize proportionately.  Thanks!  Please consider adding this to Wirecast.