1. MMM is easily programmable, although the Quark SSB will have a programming box for field use, just like a few of the ebay esc that are around.
2. Almost impossible. Only way to do that is to make the esc huge, and use lots of FETS that are over-rated for 6s 200amp use. Im thinking it would look something like the Schulze things, huge flat pancakes that wont mount in a truck very easily.
3. See above. You could put it in a case like the Quark monster pro, but again, it would be huge.
Seems like what you are after is the Tekin RX8....