I wish there were a Forward button, or a functional equivalent (such as Shift+Back or ALT+Back). There have been many times when I accidentally press Back one too many times, and it often leaves you with no convenient way to get back to where you intended to be.
It would also be useful for navigation with the web browser, and would be helpful in navigating Kindle in general (for jumping back AND forth between locations/books etc.).
All I can suggest is to send comments to
kindle-feedback@amazon.com (as I have). Fortunately it is the kind of thing one develops an awareness about, and I find myself tripping over it less and less the more I use my K3. K2 has the same problem, but the button isn't so easy to press accidentally.