I don't imagine Theresa May has anything in mind at all, but an election is a very good idea. Perhaps on the terms of exit rather than what she comes back with. She would probably win, and then at least we would know what we were negotiating for, because if she didn't include it in her manifesto she would be a laughing stock.
Your paranoia about the EU side is odd. By keeping our intentions super double secret does it make it anymore difficult for the other side to say 'No, non, nein' when they are finally revealed? How damaging would it be to say:
- we intend to stay in the Single Market if certain provisos are met; or
- we are leaving entirely and the discussions are about how we extract ourselves from commitments and institutions; or
- we will seek sector by sector agreements
So the operation of good old British Common Law and the sovereignty of Parliament to decide our 'destiny' aren't part of your desire to 'take back control'?
Eat the rich!
The EU negotiators would love it if May was forced to reveal some of her hand. If you want to achieve more, you don't go into negotiations having broadcast and defined the perameters of what you are hoping for.