In game review, up/down keys either fast forward to end / reset the board, or in case of currently observed move is a blunder switches between blunderous played and non-blunderous possible line. But this causes my key presses to frequently to do the other action that I didn't wanted it to do. I think a sensible solution would be to move functionality of skipping to the start / end of the game to a different shortcut, such as control + left and control + right, which is frequently seen in many other software and thus should be fairly intuitive
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