Show battery levels as upper keys instead of side keys on Defy

[DamianRavn]

Current display
It's pretty cool to be able to click a key to show the percentage of battery left. My only problem is that on my Dygma Defy, it uses the 3 side keys

What I would like
Using the upper keys would show a more accurate percentage of the battery left, since there would have 6 or 7 keys to show it instead of 3