Sort on Epic Rank and then Story Rank

Customer would like to request on the following:

"As a user of JIRA Agile, I would like to be able to rank epics and stories.
Given two epics A and B where A is more important to finish first due to business priority than B, I expect epic A and ALL stories contained within epic A to have higher priority/ranking than epic B and all its stories. It seems that the current version of JIRA Agile does not support this since ranking of stories is left untouched when dragging epics up and down in the Plan view.
Also when creating filters I want to group stories within their epics sorted in priority order. Thus, I would like stories grouped by epic, then sorted on epic rank and within each epic, on story rank."