There is already that option. Drag Pieces Only . Check it out in Settings.
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From the info. I really wish I could disable the 2-click. I always drag and drop. I've lost several games due to inadvertent 2-click moves. I go to move one piece, change my mind, accidentally click on a legal move square, and the piece moves, and I lose my queen (or whatever).
There are two ways to move the pieces, depending on your preference! You can either drag the pieces with your mouse, or click on the piece and then click again on its destination square.