just to be clear: Musescore is a music notation software.
even if “out of the box” it sounds good (these days), don’t look at it as a kind of sequencer with sounds pre-loaded, that’s not fair.
a sequencer is much more capable in the tasks it has been built for, expecially it you already into making some kind of electronic music or if you compare it with the tools built in a DAW.
in Musescore
if you want to create a repetition (let’s say) 5 times from A to B, go to the last measure of the “zone”, right click on it and set the number of times it must be repeated. then the playhead will move on, and I doubt there are more flexible ways to do that.
the boring part
in real world we use sequencers as sequencers, notation software as notation software and daws as daws.
tbh Cubendo is very well integrated with Dorico and works great 100% if you are into those software. Pro Tools has Sibelius, but PT is PT (and it is not MIDI friendly)…and the UI of Sibelius…[implied facepalm] is a nightmare!
of course it is possible to connect REAPER to MUSESCORE with MIDI and play them “live” (I don’t know the numbers of latency issues, but expect them to be there), but trust me, it is much easier to export a MIDI file and load it here or there.
I believe, if community asks, that in the future there could be some kind of DAW integration. I have asked in the past some braille features for a couple blind people I know. it took a while (a couple of years) but now those features are there.
If they would make a paid VST3 version like the one that VCV Rack provides in the Pro version, I would probably buy it, based of the price and the features. I can’t see it dropping soon and I expect it to be faulty in the beginning.
For now I use Musescore as a very good free notation software that also gives me a good quick hearing of my ideas. When I have to make a proper mock-up I export MIDI from Musescore, load it into REAPER and work with an orchestral library, which is much more difficult to program if you want your music to sound kind of realistic