Most of the roms already have it enabled.
You can enable it yourself of you decompile framework-res and change the bool xml like so
config_animateScreenLights from true to false
Complie and install. If your on stock 596 you may have to decompile with dependencies and just drag moto-res.apk into apkmanager window
Edit: if you are running a theme and flash a flashable zip it may break some theme elements so better off doing it yourself
O and make sure all animations are turned on