Feature request for MU4:
MU3 can display two files in the same window at the same time, I hope MU4 can view PDF files in the same way. When inputting notes again, unless you have two computers, you have to run around in different windows, although this is not impossible, but I think.... this is very slow.
I know that MU4's sound engine needs to work in different windows, and I don't know if there is a way to do it.
Text editing mode
Just like in leland's explanatory video, Score can be used to create music scores at a very fast speed. I also use this kind of software (Lilypond), and the efficiency is really good. I hope MU4 (or later versions) can have a similar editing mode, because I like leland very much, unfortunately lilypond can't import this font.
I know it's going to be tough, but hopefully the Musescore team can do it.
Freely import music fonts from Smufl or other software.
Mu4 already has a lot of music fonts, but many fonts can't be used. Although there are some codes on Git, I can't operate them.
As for legal and copyright issues, I have come up with some methods: Other fonts can only be displayed on my own computer, and only default fonts can be used when uploading to the cloud.