Press 3 to make a triangle, Press 4 to make a square, press 5 to make a Pentagon, press 6 to make a hexagon, press 7 to make a heptagon, press 8 to make an octagon, and press 9 to make a 9 sided shape.
Some shapes won't be completed or will be funky, so that is a downside. It will also start drawing where your Cursor is at.
