I'm thinking about giving one of these a try, but have a question for I make the leap... Seems that, unlike a MB/MBP trackpad, it doesn't offer a physical click. Therefore it more closely resembles the MB/MBP tap-to-drag. What happens if your'e dragging from one end of your screen to the other, and run out of pad? Can you dive in with a second finger, or do you have to go back and start over? I hope that makes sense. Thanks.