"Undo" move button

Kind of what someone posted regarding an "undo" button for map making, but I would suggest an "undo" unit move button in actual game play. It is kind of annoying when I can't cancel a unit move during a turn, or for some reason, the "x" circle doesn't pop up or can't be clicked due to other surrounding units or lines. An "undo" unit move button would allow you to "undo" your previous units moves in respective orders from the start of a turn that you made, thus allowing you to go back without having to click the red "x" circle. Just a suggestion.