I wholeheartedly agree that the “Use the Backspace key to go back in your browser’s history” is about the dumbest damned thing I’ve seen.
It’s a browser convention that’s been around for a while. It’s not a function of the web site, and hence it’s not unique to Fluther. If nothing else, I’d like to see a pref whereby the user could toggle that “feature” off.
That said, I have seen where it appears to inconsistently implemented. If anyone can link to a detailed spec of how that’s supposed to work and the cases where it’s not, I’d appreciate learning more.