Dorico development isn’t run as a strictly democratic process. There is both wisdom and madness in crowds. Instead, Dorico development priorities are typically set by yours truly, in the fashion of what I hope is a reasonably benevolent dictatorship, and where the priorities that we agree on internally as a team take into account as much feedback as possible from the tens of thousands of active Dorico users who take the time to contact us about their needs. You will not be surprised to hear that your own needs may not be shared by every other Dorico user.
All of this is a long way of saying that no, we don’t have a formal way to vote on feature requests. Posting here on the forum that you want something is the best way to let us know about what you would like to see in the software. You may even find some other users chime in to say that they agree with you. We don’t mind seeing the same or similar feature requests multiple times, so please don’t be afraid to share your needs for the software. (Though do try to be brief: there are, as I’ve mentioned, tens of thousands of you and only a few of us.)