A control to move subtitling and captioning on active picture (for 2.4:1 displays or projection)

If you project a 2.4:1 movie or TV show to a 2.4:1 screen, so that the movie fills the screen, and then turn on captioning, the captions are shown off the screen. If there was a option to limit caption to 2.4:1 region, or detect the active picture, Roku could support more screen shapes.