It doesn't exist under CyanogenMod; I haven't had any adverse battery effects under CM so I'm wondering if it blocks the OTA from being downloaded at all somehow? Seems like OTA isn't even a concern with CyanogenMod, and I'm thinking that might be because CyanogenMod is built from AOSP and as a result also has other settings for other phones (you can find trackball settings that don't do anything for Droid users, for example), and all of the other ROMs are built from Verizon's official Droid ROM.