This is probably the most annoying usability issue in Jira for myself and my users: when action menu (invoked from More Actions link or as a separate action menu) contains more items than fit in the remaining part of the screen, then remaining menu items will be cut from visibility and will never be brough to the front of screen (as menu control is not scrollable). See an example below (there is a number of items below Log Work which are never visible)
