The general feedback is clear, but in order to have effective feature requests, they need to be precise, and not to mix multiple features at once.
It doesn’t matter how many votes this request has, a developer cannot do much with a request consisting on “better [something]”.
@Biggo @pier or anyone else reading this comment, would you like to focus here on the biggest piano roll related feature you miss (just one) and then, if you want, create other requests for other features?