Can Play Mode prevent from vertical scrolling / reloading?

Is it possible to change the instruments, midi channels etc in Play Mode without reloading the page? When I have a lot of instruments to save the after changing the VST instrument this page is reloading from the first track and the changed track (where I have to change the midi number) I only reach with scrolling.

Not currently. This is an optimisation we’ll hope to implement in the future though. Currently there are quite a few things that cause the Play Mode window to be recreated.