If there is a referendum on the final deal with the EU then the options must be simply deal or no deal. There must be no option to stay a member of the EU.
You may be interested in these active petitions
It was clearly stated in the pro EU booklet: 'This is your decision. The government will implement what you decide.' The once in a generation decision on whether we want to be in the EU or not has already been made, we voted to leave and that must be respected either way whether or not we can get a good deal and there must be no option to stay a member in any vote on the final deal.