EDIT: I have renamed and developed this request.

We use multiview for many things. We would also like to be able to quickly switch in the Input's setting between two (or more) templates that has been added to the Inputs "standard set" of multiview templates. But new templates are added to the bottom if the list, so one must first scroll down to find the ones we have added. As we don't really need the standard ones it would ease up the process if also the standard templates could be removed.

Edit: as from v16 (perhaps earlier) the following is available in Shortcut SetMultiViewOverlay.
Another improvement would be if the shortcut SelectIndex also supported Multiview inputs. Described for example as:
"Photos,List: Selects item in list according to Value starting from number 1. Virtual Set: Zooms to selected preset using the current speed settings. Multiview: Select template to be used".

Perhaps it would also be useful if there were shortcuts for each multiview overlay's position settings.

bumping again, this time because SetMultiViewOverlay solves the second request above.
Being able to sort the Multiview templates is still an open request.