automatically switch between video/visualisation

I have seen this request many times on the forum but no answers from tech support:

I would like the video/visualisation window - both when docked in windowed mode and in fullscreen mode - to automatically switch between video/visualisation depending on whether a video or audio only is playing.

I.e, if i am playing thru a playlist of a mixture of videos and mp3s, i would like the video/visualisation window to automatically play video if the file is a video and play the currently selected visualisation plugin if the file is audio only.

Is there already a way to do this?

crosspost

*whacked*