We have a Kanban team responsible for developing/maintaining several projects. I'd like to know if there is a way in JIRA/Greenhopper to create a single backlog showing issues for all projects. Ideally, I could pull up this backlog in our prioritization meetings and re-order our issues as needed. The Greenhopper Planning Board is exactly what I need - except it only shows one project. The plan mode of the Rapid Board sounds like it would do multiple projects, but it only works with scrum boards. 
1) Does Atlassian plan to enable the Rapid Board plan mode for Kanban boards some time in the future?
2) Does anyone have a good way to address multi-project backlog prioritization until they do?
Thanks,
Jason