Off-screen navigation button / single navigation key configuration

[krige]

I am missing two actions from the conventional virtual navigation bar:

1. Double tap on the recents button to switch between the last two opened apps
2. Notification menu pull down button

Is there a way to set the actions associated to the gestures in the off-screen navigation button?

It that were possible, I would reconfigure the swipe left to the action 1 and swipe down to the action 2 above.