As an Advanced Roadmap user, I want to be able to configure a Plan based on a filter and see the assigned Sprint information and Sprint Dates for the issues that return in that filter so that I can display a Gantt chart for a Project.

Right now, you are required to use the issue source of "Board" and for a project manager who may be managing a project that touches multiple Jira projects or boards, it is tedious to choose each and every board. 

If we could still use a JQL filter to return all the issues in a certain hierarchy, but then still display the Sprints they are assigned to and the bar on the timeline for that sprint (if it has dates), it would be extremely useful.  I would understand that we would not want to allow "scheduling" in this view maybe but at least for display.