That setting is for 1080p 24 Hz input signals to the TV, such as from a BD player. Of course, you'd need to enable the BD player to output 1080p 24Hz to the TV for that option to be available in the TV menu.
What I'm saying is use a calibration disc to set each picture mode separately. Don't transfer settings from one mode to another. I recommend the free AVS disc to do so as the patterns for brightness and contrast are very precise on it.
Just finished doing just that, and thanks. Set to "Custom" and just forgot about Cinema mode settings and really took my time and adjusted via the disc (although it may not be the most precise disc). So far im happy with my updated settings. They are updated in my above edited post.
Custom as of now:
Brightness : 50 (same as Cinema Mode)
Contrast : 75 (-25 lower than Cinema Mode)
Color : 60 (+10 over Cinema Mode)
Tint : 0 (same as Cinema Mode)
Sharpness : 50 (same as Cinema Mode)