I love the trim tool where any line you touch gets trimmed back. Please add another feature that makes the inverse happen. Any 2 or more lines you scribble over get extended until they intersect. This would be a super fast way to connect multple line segments. It also would make it so you dont have to pick directly on the line to extend. You could make an icon smilar to the trim tool, but maybe with a green squiggly line for extend instead of red for trim.