Within the new version 2.8 beta (rolling out), there's an early attempt for better Doze mode in control. It currently activate doze mode as early as the screen goes off, and deactivate it when the screen is back on or the charger is connected.
The best part of this feature - NO ROOT REQUIRED! Still you need to perform a one-time procedure with USB-cable and a connected computer, which is surely familiar to many of you XDA members.
This is not the complete solution for a better Doze mode. It is expected to maximize the power-saving effect of Doze mode, but may also break some background functionality of your apps. So I'm listening to all your feedback and opinions, to build a smarter and finer-tweaked Doze mode in Android 6.0.
Together with the "Shallow Hibernation" released in version 2.7, let's start a new adventure of Greenify with Android Marshmallow.