I agree the gamut controls are not listed in that manual but they are in fact available for the cinema and expert 1 and 2 modes (which I would think would be the best gamble for starting points). It is a one axis luminance control for each primary and secondary.
http://www.projectorreviews.com/lg/cf181d/index.php about half way down. The gamma was terrific…2.35 or so and very smooth.
