Applicable Products : IJCAD 2016
In IJCAD 2016, when the cursor is overlapped on the grip of selected polyline, grip menu will be displayed and you can quickly edit there, such as to add the point.
You can change the selected option as follows, even if you mistake to choose the grip menu item.
The grip menu for polyline is added from IJCAD2016 and you can also change the option
— IJCAD.JP (@IJCAD) June 6, 2016
by CTRL key, even the menu is chosen by mistake.