Very long notes
From my days playing jazz charts written by Hank Levy (whose notation was a little...unorthodox; great charts, though), I'm used to being able to represent a note that takes up an entire measure in an odd time signature by the use of what I originally construed to be a mathematical symbol, namely, a whole note surrounded by vertical lines, as if to say the absolute value of the whole note, to wit, the entire measure. I don't know if it was unique to Hank; but I do know that most of my contemporaries from the time understood the notation. Apparently, that notation is so unorthodox that MuseScore is not able to recreate it, especially considering that the whole note surrounded by vertical lines has a specific value in MS, namely, an double whole note of eight quarter-note beats. Am I right?