I think the best change in plea-bargaining is if a bargain was offered and rejected, then the prosecutor has to win on all counts, and get the full penalty asked for, or get nothing at all. It is very likely that not all 19 counts would have come back guilty, so in a case like this there would be incentive on the prosecution side to only push as far as is likely to be won. And, I think this has some merit in the same spirit as the double jeopardy section of the 5'th.