Clickpad trouble - pointer moves and releasing the click accepts selection

Question

The clickpad on my Macbook seems too sensitive under Ubuntu. This really becomes an issue when I'm trying to right click. The behavior I'm seeing is that when I click with 2 fingers (physical click, not tap) the motion of my fingers pressing down registers as a slight movement and causes the first item of a contextual to become selected, then when I release the click that selection is accepted. I have tried making faster clicks, but that does nothing to solve the issue. Is there some way that I can either slightly increase the minimum movement that the pad will see as an intentional move, or increase the amount of time the pad sees as a click before it think I'm navigating a menu with the button depressed (and thus accepting a selection when the button is released)?