I've got the same question, but with a different spin - is it possible to create my own MultiView layout options and have them added to the Settings > General > Multiview > MultiView Layout choice list?
I.e., can I create and add a "4x scene plus preview and program" or a "8x scene with only preview" ?
My use case is a live recording environment that has limited screen real estate available, where wasting a row of blank scenes in the 8x layout and/or having 2x program views (one in MultiView and one in OBS...) is undesirable...