/off-topic but related to N9

One thing baffles me.

I got N900 on 2009 Christmas and one of the first things what I loved was ability to get cursor hand in Microb if you swipe off-screen to on-screen from lower left side/corner. Also ability to get history view if you swipe from right off-screen to on-screen btw. I voted bugzilla entry that suggested Nokia to give us option to change it to simply back button functionality :|.

Of course I thought that there will be all kinds of apps that use this kind functionality of user interaction from off to on-screen. Stupid me So is this functionality hard-coded inside Microb or what is going on? Now people are talking about how N9 has new kind of usability approach and I´m just thinking that WTF, that should have been possible with N900 couple of years ago.