I'm trying to engrave some piano music where the dynamics don't belong to either of the staffs, but refer to both staffs. If I put them in on the RH staff, they're a bit high.
Also, I have to use the << || >> construction a lot because there's a mix of homophonic and polyphonic writing. I can't work out how to start (say) a crescendo in the middle of a polyphonic section and terminate it in a monophonic section, and vice-versa, as LP associates the cresc with the voice, and then complains that it's not terminated.