It would be rather nifty if I could push the backspace button (when not in a text box) and go back a page. I got rather used to this useful feature in IE but then found out that a better browser existed, with one very minor (but easy to fix) shortcoming. :-)
I would recommend binding another key to "go back" since there are problems with backspace (both in k-meleon and IE (I have many times hit backspace in IE to delete some text and had the page go back, I then proceed to curse Microsoft)). I, personally, use alt+left. You could really use any key you want though, like F12 or something.
Brian's right. You can do this in K-Meleon but in just the little time I did it to test it, it drove me crazy sending me back pages when I just wanted to delete some text.