beam across hidden staves of a grand staff
Extra staffs are common in piano sheet music to separate voices when they become too complicated for a single staff (among other things). These staves are voice staves of the same grand staff, and for the majority of the piece they are hidden (style -> general -> score -> "hide empty staves"). I would like to be able beam across hidden staves.
A simple workaround is to shift the notes onto the hidden staff (hiding the previously visible staff) so that cross-staff beaming works again, since there is no intervening hidden staff. Unfortunately, with too many voice staves (>= 6), the required clef changes are confusing and unnecessary.