The drag-and-drop function in the sheet index can be very clunky at times. Sheets have to be moved in groups of 3-5 at a time, otherwise risking the program crashing. It would be nice to see a different function added to the sheet index in the Explorer - my suggestion would be to add arrows to the sheet index icon bar to allow you to move the selected group of sheets up and down. This would also help stop the sheets from reversing their order when dragging and dropping.