In order to move rows/cells/comuns, it would be very convenient to have the 
possibility to drop them somewhere without them overwriting other cells, but 
creating new cells/coluns/rows instead. 
 
For example: 
Row 1 
Row 2 
Row 3 
Row 4 
 
Select row 2 and drop it on row 4. Row 4 will be overwritten. Instead one 
should be able to press some shortcut, e.g. ALT in order to get the following: 
 
Row 1 
Row 3 
Row 2 
Row 4 
 
It is worth discussing, whether it might be better to get the following when 
just pressing ALT: 
 
Row 1 
<empty> 
Row 3 
Row 2 
Row 4 
 
So one would have to press ALT+CTRL to copy and create a new line for the 
drop, or ALT+SHIFT to move, i.e. leave no empty space and create a new line 
for the drop. 
 
This is very helpful when re-arranging tables, as it skips two clicks per 
action, i.e. right-click on row, add new line.