Hijack back button when reviewing patches

Using dreditor to review patches is great, but I ALWAYS find myself hitting the back button (actually, keyboard shortcut) to get back to the issue, when I should be pressing cancel, or hide. This is confusing, cause I end up in the wrong spot. Worse, I loose everything I've put in the comment box (although this is actually a BUEditor bug)

It'd be great to hijack the back button, when the reviewer is open, so that instead of going back, it hides the reviewer. Once the reviewer is hidden, the back button should return to normal operation. I dunno if it's worth bothering with the forward button, but I guess it wouldn't be much more difficult.