I'm pretty sure there is no way to disable it without pestering around in terminal.
I'd be more than happy to use Terminal to get rid the behavior.
Why disable it anyway? Since you are using a trackpad it does nothing but create a dynamic experience.
I don't see how using a trackpad would warrant the bounce at edge effect any more than using a mouse. Either way, it's just plain annoying, especially on a 15 or 24 inch display. At the very minimum, it should be configurable - give the user the choice.
I predict that any third party tool to disable this will be extremely popular (hint hint tool developers).
There's no known software method of disabling it at this time; not even by using Terminal. Third party mouse is the only known way at this time.
What's a "dynamic experience"? It's irritating as anything. I scroll down to the bottom of a web page, go to click a link, and miss the link because it bounces away from the mouse pointer. Arrrrgh!