jadarite: You can do everything you said already with the current system, where you can click on a move, see the effects it will have on the board position, go away and have dinner if you want, then come back and cancel the move if you don't like it. So long as you don't submit the move before being 100% sure that's what you want, you can do anything you want with the board.

And I'll be blunt: if you submit the move without checking it properly, then you're doing things wrong, and the developer shouldn't have to waste precious time and energy compensating for your own inability to use the game features that are already there.