It would be cool if "DMX Layer" are working only if there's a video (to control lights) on the column. Therefore, you can play manually it.

Or the ability to have a specific video layer for the dmx layers (lights) and also a "normal video" layer (for outputting on the beamer).

When you have a light AND a DMX Layer with the same adress (same projector), the slider is always back up at zero, even if we don't put video in (detecting black of the canvas). So we can jump to a "scripted lights show" from video and then back (with transition) to a normal "light console" state.