first (home)
prev (left)
next (right)
last (end)
single
ribbon
toggle ribbon view (space)
toggle wide view
create ribbon above
create ribbon below
merge ribbons up
merge ribbons down
demote image (up)
promote image (down)
NOTE: ctrl-up / ctrl-down will demote / promote an image to a new empty ribbon (default if no ribbon exists)
focus above ribbon (shift-up)
focus below ribbon (shift-down)