measure of undefined duration
Entering cadenza-like material would be much easier if an irregular measure could have an indefinite duration. As it is, as far as I can see, one must either calculate the actual duration ahead of time, or designate a longer duration than needed, enter the notes, calculate the total duration of the rests remaining, return to the actual duration, and subtract the total rests. If the rests are, say, a whole +a quarter + an eighth + 3 sixteenths, this is not easy. Similarly, it would be nice if one could copy and paste a passage including irregular measures without specifying the actual lengths of the receiving measures ahead of time.