I'm quite the opposite opinion and use Backspace to go back extensively, because it means that I can browse the web with one hand on my laptop with trackpoint.

If you're accidently clicking on things, maybe learn to use a mouse better.

P.S.: Oh and if it's a crappy touchpad making unwanted inputs, then I share your concern (and probably a good time to look at other laptop keyboards; turning off the touchpad on this Lenovo was among the first things I did). But still, they really should make this an option...