maybe i'm just too new to the game (just started playing a couple hours ago) and i've missed something, but so far my biggest (and only) complainant is that occasionally i'll select a move card only to realize there was a better way to spend my turn. all my fooling around hasn't revealed a way to cancel/deselect the move card as i can with some other cards. if i'm missing something please point it out, otherwise, i think it would be a great addition to allow a person to choose not to use a move card after having clicked it.
Once you select a move card it cannot be canceled. You can however highlight the card and it will show you where it is possible you can move to before you move. Lot of cards cannot be canceled upon selecting due to it triggering other cards that will affect the action (I.e. encumber on move)