@VampyricalCurse: With the built-in behavior, the way things are coded yes, it's better to stick to 8 points.
Ashley had to code the physics behavior so it can be widely used, in many cases.
He had to make decisions to manage this.
But Armitage said he wanted to develop his own plugin based on box2D. So after all, maybe a specific implementation may help raising the possible number.
A plugin specificaly coded for a game could handle only issues of said-game.
I think in theory that makes it possible.
Now to see it actualy done is yet to be seen.