When sketching, I like the Center Rectangle function where you click on a point and then drag to place the corners of your rectangle. I would really like a similar function for sketching lines. I frequently sketch a line and then make the midpoint coincident with the origin or some other point and that's a lot of clicks. It would be nice if I could click to set the midpoint of a line, and have it extend in both directions when I drag. Does anyone else think this would be helpful?