Copy and paste with triplets, and similar problems with MIDI to MSCZ

I convert a lot of MIDIs to MSCZ files, and sometimes notes are automatically put into triplets when they shouldn't be. It can be tedious to remove the triplet and then manually write each note, but copying and pasting inside triplets doesn't work. I saw that someone suggested a kind of "special paste", where it only pastes notes and not their length, and this could solve the problem of copying from triplets. I would also like more conversion options, such as not automatically creating triplets, or the option to convert to a different time signature.