Allow team members to vote on icebox items

It would be nice if team members could vote on items in the icebox. Pivotal Tracker makes it very easy to capture stories, however if team member want to come in later and review icebox items, they are limited to adding a comment to the icebox item. It would be nice to gauge interest by adding a simple +1 or -1 voting system, that way team members could periodically review logged items and raise or lower their priority.