Jumping off the direction of the surface sounds like a very interesting mechanic. Makes me think of N.

As for a top speed, I believe body:setDamping(n) and body:setAngularDamping(n) are what you're looking for. I haven't played with them yet, but it's on my list.

Oh. I was under the impresion it was most of love.graphics. I guess that's right then.
I'm of two minds about text.

These are some serious gotchas then. I take it the GC doesn't handle the stuff passed to the body because the library is in C?

Co-ordinate changes are ew, I hope when the Camera code goes in it all gets unified.

I had this problem too, although my balls were not actually reaching the box, they'd stop a ways before collision. This is troubling. I'm storing everything in a seperate table, and am not doing any scaling at all.