Yeah, I have a problem with both pen and lasso tool. Whenever I get to an edge, it scrolls really quickly. How do I stop that happening?
That happens automatically with the lasso, although with the pen tool it shouldn't. To prevent it with the pen tool (the lasso can't do this), use the scrollbars at the right and bottom to simply move the image around, and dont hover near the edges of the view. Alternately you can use the navigator (Window -> Navigator) to click where you want the view centered.
No it's actually not. This method is best on pictures with complex backgrounds, mostly because of the pen's ability to back up and zoom in and out in the middle of creating a render.