Min/max values for Contrast

[pureby]

Hello everyone, my first post here.
First of all, big thanks to the creator of TwinkleTray! What an awesome app, saves so much time, and good-looking too! Thank you very much :-)

There is a feature in TwinkleTray called "Normalize Brightness", allowing to set Min/Max values for brightness slider.

It would be great to be able to set Min/Max values for Contrast slider as well.
This would be useful not only for multi-monitor setups (as an equalization tool), but also for single monitors.
For example, my monitor has range of 0—100% contrast, but going above 50% distorts colors and makes some text unreadable, so I never go above 50% contrast.

However, I adjust within 0—50% contrast range very often (as means to dim screen below 0% brightness). It would make adjustment a lot easier if contrast slider could be "locked" at 50% value.