One additional option would be great,,,, consider adding an orthographic mode to the line tool! Since most lines drawn are either horizontal or vertical, it would be nice if the line tool would snap to these angles. If one needed to draw a line other than that the "swing" option would still do that. This is almost always an F8 toggle in most cad programs. Or maybe simply make it snap to 15 degree increments, maybe that's a little too fancy.