Thanks for your suggestion.
That would be an useful feature for some situations indeed. The trouble is that all the game logic is based on transfering cards one-by-one. So anytime you click on a card, you change state. Moreover, for few dogma, clicking of a card are further implications than just transfering it so you get information you would not have if you haven't done that move in the first place.
So making an unrolling mechanism would be super-hard...
In response to the previous post:
I see that this question keeps coming up. I think I understand what you mean by saying that some information is revealed only after a card is played. However, would it be possible to consider a Cancel feature? That is if I selected a card, but not played it - not being forced doing that, and cancelling the selection?
I don't know, how much less "fluid" would it really make it if cards were visibly highlighted on single-click and activated on double-click? That's how plenty of software already works, and it would add no real delay at all in the case of deliberate moves. But it would also drastically reduce frustrating misplays, especially for folks playing on tablets & touchscreens, where it's awfully easy to accidentally trigger a card while attempting to scroll.