Rated 1 out of 5 stars

should be a right click as add quick text, no icon. or insert quick text from insert menu not toolbar in new message

This review is for a previous version of the add-on (0.9.9.9). 

It is possible

If you look in the settings window you can choose to show the option to insert templates when you right click. And if you click View in the toolbar you can select to hide the Quicktext toolbar.