Enable Select or Autocomplete Renderer for new Greenhopper Sprint field

The new Sprint field used by the Rapid board, separate from the Fix For Version, is great.

However right now a big flaw with using it is that there is no convenient way to set it directly from the Edit Issue view (as opposed to using the Plan tab UI of the Rapid Board). This is often necessary - say there is a critical bug that needs to be filed and added to the current sprint, it would be nice to do it in a single shot rather than having to create it, find it on the rapid board and drag it into the sprint.

You can add the Sprint field to the Default issue screen, which makes it appear when Editing the issue, but this shows a text field where you have to enter the ID of the sprint. Since this is a system-level value that no user would ever know, its less than useful to non-power users.

The ideal would be to enable the use of either a Select dropdown or an autocomplete-type editor a la fix for versions. I suspect this shouldn't be too hard to do, just allow the Autocomplete/Select renderer for the Sprint field.

If there is any workaround to get this working before it's released (say some sample plugin code) that could be posted this would be great.