May be a little personal issue but I think that "Delete line" action should delete all lines with selected multiline
text. In the current behaviour editor delete only line with the cursor. 

Use case - Deleting big text parts:
 - selecting text with the mouse(right hand, left hand on the keyboard)
 - want to delete this text -> need to press delete button -> need to remove hand from the mouse -> will be better to
delete text with Ctrl-E

IDEA have the same behaviour as NetBeans
Eclipse do it in my way