Default Smart Radio

So one of my favorite features of Cataclysm is the smart radio feature. It really is a huge lifesaver for the battery on my N5. But as always I have that itch to flash something new. Are there other ROMs that have a smart radio feature, or is there a way to replicate this on other ROMs? Basically I wanna switch to 2G when my screen goes off and back to LTE when I unlock my device.