Greenhoppers custom rank field is read-only in JIRA.

It would be great if there was some renderer for that field in Jira, so while editing an issue in Jira, I could click a button next to the rank, and enter or select a different item to move the rank next to and also select if the item shoud be moved "before" or "after" the selected item.

e.g. if my items and ranks were

A with rank 1
B with rank 2
C with rank 3

And I was editing Item A in JIRA, I could click a button see a dialog box, and select item C and indicate "after" and that would cause A to be moved after C in rank as follows.

B with rank 1
C with rank 2
A with rank 3