Yeah that’s right but Notessimo only supports 4/4 and using 3/4 is like using a Spanish dictionary to look up English words.
It may only support common time, but couldn’t you work around this by ignoring the set bar lines? This seems workable.
Brath’sil
Yes for harder time signatures and tuplets ignoring the measure lines would be the most practical thing to do, but it would be easy to lose track of things and duplicating/copy and pasting would be limited. For 3/4 it would be easier to just multiply everything by 3 than start a whole new length system.