A "timeline" based graphical interface would be extremely helpful in programming shows, chases and effects across multiple fixtures and fixture groups.
To be able to select a group of fixtures, set up effects/colours/etc . . . and then to use a track based timeline UI to offset the effects/colours/etc per fixture would be an incredible addition to the console.
As a video/commercial/visual effects artist & editor for 30 years, this is the way a non-linear device becomes a great tool - and I firmly believe that this would bring the dot2 to another level.