So I have two somewhat related questions. Firstly, is there a native way in lilypond to work with piano scores with more than two staves? I am hopefully beginning work on a project soon where I will be working with a three staff piano part, and the PianoStaff environment doesn't seem to support having more than two staves. I've been doing some setup and doing a StaffGroup with three staves seems to work fine for the most part but it does change the bracket on the side and I would like to get the curly piano style brace back.
Relatedly, is it possible to utilise cross-staff beaming within StaffGroup and not in a PianoStaff? I've tried just copying and pasting from the official documentation (here), but it doesn't seem to work. I think it's because I have my staves in the score environment rather than just writing directly into the staves as in the examples. I am working with the template from the wizard in Frescobaldi, should I change this, or am I just missing something obvious?