With the announcement of vMix 28 offering a more customized (and additional) output multiview, I'm eyeing a change from a custom multiview input to the system generated multiview output for the additional functionality (audio meters, etc.).

The only downside, and it's a fairly large downside, is the inability to reassign slots on the fly, as needed.

Right now, with my custom input multiview, I use "SetMultiViewOverlay" to change between the various things I need to see, as I need to see them.

I only need to keep an eye on about 6 different things at a time, but those 6 different things change throughout the course of the production.

The ability to set the output multiview slots on the fly via shortcut--as one can with the fullscreen outputs, outputs 1-4, and the input layers--would be massively helpful.

People have brought it up in non-Feature Request posts, as well, such as here.