The idea of the pro modes is to give you two default, untweaked settings modes with every option unlocked. It's for if you want to do a full calibration(s), and of course that's the best way to get a proper colour temperature etc.
As I mentioned above Res Enhancer will do nothing unless the input is SD, and even then it's subtle. Sharpness is another thing you should just change yourself. The difference between 2 adjacent 'notches' is very small, i suggest loading some typical viewing material, freezing the picture, and adjusting it yourself to see what happens and what looks most natural to you.
By the way, for those who don't know the freeze picture button is right below the Blue button on the tv remote. This lets you freeze the current image, and then open menu to adjust things like Sharpness while the image is still as this is sometimes the best way to see alterations. Pressing the button again unfreezes the picture.
Some people prefer to make adjustments while there is motion, but it's harder to see differences this way, so it's best if you can for example get a small clip to repeat itself.
