I sympathize with the position of an unpaid developer and, if the case is extreme enough, rescission laws do enable one to break such a contract. I don't think

I sympathize with the position of an unpaid developer and, if the case is extreme enough, rescission laws do enable one to break such a contract. I don't think this will normally help a developer who is denied the last payment - in that case, fair or not, the law will normally limit the remedy to one of suing for payment. Of course, the problems can all be avoided if the terms of the contract explicitly state that no IP rights will transfer unless payment has been made in full. In that case, I would agree with your assessment 100% (I don't disagree with your other points either - they are good clarifications).