That would be quite hard to do without a special case, since the default action of the back button is to pop the current activity off the stack and return you to the prior one. (I know too much about this from trying to add a button in an existing app to do the same thing)
It's a shame it's not available though. It'd be useful for navigating tab history in firefox. (currently, hold down back button and select from menu)
It's a shame it's not available though. It'd be useful for navigating tab history in firefox. (currently, hold down back button and select from menu)