I bought the Signature M650L Left expecting it to be truly left-handed with the left and right buttons mirrored compared to a right-handed mouse. The support page says "Your mouse will still have the main click function on the left. If you prefer to swap it to the right button, you can use Logitech software." But the Options+ software doesn't support swapping. Please update the software so that left-handed users can click the main button with the forefinger of the left hand.