Ahhh, I see that you need a "Rev. C" chip for the boost function! Who knows, maybe they will start showing up in the clones if they stopped making the "Rev. B" chips. Interesting reading, because if there is a DC-DC converter on board, maybe retrofitting MOSFETS for the motor H-bridge wouldn't be impossible as I had previously thought. (SMD logic level FET's would do nicely)
With FET drive, more powerful motors would probably start more reliably.