I agree with the auto-move if only one option improvement. There are several games where this would help (especially in turn-based) immensely. A down side I could see to this, though, is when one would like to see what was rolled that gave them only one choice. Can't Stop when only one option is available; Stone Age when one is the last to choose in the lottery, or has no tools to add to one's roll. Times like that. A more detailed log would solve this issue.
However, there are some concerns with conceding games of more than 2 players. Primarily, who wins? Let's take a game where the high score wins. Player A has 100 points, and next turn will earn 1 point. Player B has 99 points, and next turn will earn 20 points. Player C has 1 point. Player C would most likely like to concede. However, who gets the victory? Player A because they are currently in the lead? Player B because next turn they will have 119 to A's 101? Neither A nor B, because someone left? Both A and B because neither were the one who conceded?
I'm not saying it is a bad idea, just that there are issues. Currently, there is an abandon game possibility, which then becomes neither A or B get the win. One just has to have A and B agree on it...