How to have display temperature control??

Hey, guys. Is there any other ROM BESIDES PARANOID ANDROID that can give me the ability to control the display temperature? In Paranoid Android 5.1.1 (build 23rd of Aug) you get a slider in the Display settings that lets you control how the display looks. I really like this feature and it's the only thing holding me back from flashing a stock Motorola ROM. I REALLY DON'T want to install any blue light filter apps, like Twilight. They slown down the device. I use this feature to help me sleep better but I hate using 3rd party apps.

Alternatively, is there any way I can flash that feature into a stock Motorola ROM or any other ROM? Paranoid is giving me trouble and has no support anymore. Thanks in advance guys.

What temperature should I limit my phone to?

The HTC One M8 only has a battery temperature indicator (and from what I gather, these components aren't too reliable, but I digress.) I've recently reinstalled BOINC (the manager app for SETI@Home) and it constantly starts and stops based on the default values for temperature. By default, it's set to stop computing when the battery reaches 40°C. This seems low to me. I'd like to increase the value so the app runs more often, but I also don't want to literally fry my phone.
What is the maximum temperature my battery can safely reach without damage? How accurate is the sensor in this model? (Gunmetal, if that makes any difference.)
Thanks very much.