NCIDENT
I was playing Yahtzee turn-based and was on one browser window. I had BGA open in another window on a Yahtzee game, and it was my turn, and I had nothing filled out yet. My roll was something like 1,2,4,5,6 and it was the first roll.

I went to click on the latter to activate the Window and play my turn. That click was on the "Six" cell and it took that as my action. So it posted 6 points.

SUGGESTION
Since the game doesn't have Undo, then certain moves should be classified as a "probable mistake" and the user should have an OK/Cancel confirmation. Example:
* not on the third roll, AND
* user is clicking in Part I

The only time this move makes sense (not taking the extra rolls) is if you have a Yahtzee and you've already taken the Yahtzee space. It's not necessary to program that exception, users will intuitively understand the action confirmation, and it will appreciate it in those uncommon circumstances where they mis-clicked.

PRECEDENT
Yahtzee on BGA already has action confirmation for when you claim a 0. It works well. Action confirmations aren't annoying as long as the rule is well defined and intuitive.

No upvote for this suggestion in two years, closing it.