That's the very first thing I tried and it wasn't working at all for me earlier. Backspace was navigating to the previous page.
Now it seems to work... sort of... sometimes it'll clear one of the characters in the cell and sometimes instead the global handler traps it and attempts to navigate to the previous page in my web history.
I believe I've corrected the backspace bug with a little help from a pull request, preventing default behavior and patching it through the same route the delete key follows. My machine doesn't have a backspace key, so I missed it during testing. Thanks for the heads up!
