> So make them an option and stop taking the Chrome route of stripping out everything that more advanced users use regularly.

Did you really use backspace and "move back" on regular basis? Why? You most likely aren't browsing the web with just your keyboard, so unless you are a leftie it requires you to either move your hand back to keyboard or move your hand across the whole keyboard and why would you do either of these when you can just move back with your mouses thumb button?