Alternate piano instrument layout
This may sound odd, but there's an arrangement that I want to use MuseScore to write, but it's an arrangement that utilizes the "three-hand effect". As such, I'm wondering if there's a way to alter the piano instrument layout so that there's 3 staffs instead of a grand staff, and the extra one isn't appended at the top, but instead is in the middle of the other two. That's where I'm putting the melody.
Basically, I want the layout to look like it does in Franz Liszt's arrangement of Franz Schubert's Ave Maria. How do I do that?
If this feature isn't available, make it available ASAP, please; also move this to the feature request page.