I'm no programmer, thats why i cannot contribute, but i tried the switcher app and while it worked, it is too sensitive and it flips through open apps like mad if i accidentally hold down volume button too long. Can this be done so that key release switches an app?

Also can homescreen be excluded from swither?

I realise it is your free time and will to implement this. But maybe you'll want to make an purchasable app later? I personally think it would be nice addition to n9.

edit: Or i could add 'next' and 'previous' buttons to quicklaunch running a cycle app, that would be nice too, i'm not using quick launch too often anyway. Just a thought.