Update:
The FogBugz program manager has big plans for
For a future release, we would very much like to improve the slickness of the grid view, potentially including such goodies as drag-and-drop and greatly expanded in-place editing. In short, we intend to continue to improve usability and editing, particularly around grid view. In the meantime, that plugin interface case is open as well.
We have a case open to consider adding a plugin interface for the context menu in grid view. Via a plugin using that interface, you could add any sort of editing you need (Case FC1377104). We also have cases open to add various oft-requested context-menu items such as priority, status, assigned-to and working-on
