Interactive Scores like NoteFlight does

I would like to make those so-called "interactive" scores for Arrangeme. I am invested in MuseScore, why must I use another platform (Noteflight) to be able to do this? AFAIK MuseScore does not do this, but I'd really like to be wrong about this. Of course I can do the work in MuseScore then import it to Noteflight but it would be nice just to do it directly. If MuseScore CAN do this, pls tell me how. We know the playback tempo can be adjusted on the musescore.com website, & U can go into piano roll mode, that's the website doing a transform on the data. It seems to me that all the data to do those on-the-fly data adjustments including transposition is, in fact, already embedded in any xml from MuseScore.... (a key signature is a key signature!) am I missing something? No luck googling this! I suspect it might be artificial and not technical, just so that Arrangeme can charge would-be arrangers a pay-to-play fee up front for storage expense in case their scores don't sell? Experienced arrrangeme users, do tell!