There are a couple of issues that are important to me and maybe to others (or maybe not). Is there a way to get a list of open issues and give users a way to vote on what is important for them so developers could concentrate on these issues?
I'm pretty sure they go by frequency and quantity of messages on the forum to rank the items.
Exactly that. If someone posts about something on the forum (and they haven't posted about it already) then it's the same as a vote.