same here. overnight idle, my result still maintain, no issue.

for screen off/sleep i prefer the hardware method, use magnetic cover as N5 has magnet sensor

http://forum.xda-developers.com/showthread.php?t=2537839

for those haven't try SlimKat rom before, I found a youtube review from xda thread:

data =/= storage

just wipe normal, don't need to go advanced settings. the normal wipe in TWRP is enough for you to flash another ROM.

I always in custom rom, so I usually dirty flash only (lazy  )
1. download slimkat zip from pc then transfer to phone
2. restart phone in recovery mode
3. flash slimkat zip, Gapps if newer, flash my fav kernel, flash moto x Dalvik+bionic library, then wipe dalvik/cache
4. reboot when all process done.

if something went wrong, redo again from step 2 but add factory reset before flash. << hardly happen....

Long time didnt do this advanced wipe, but if remember correctly, wiping data DOESNT erase your storage. That's mean your folder of music/photos/zip will be safe, as long it's not inside specific apps's folder.

congrats   now waiting for SlimKat 4.4.2 Build 3.2 release....

Any rom that is feels and look exactly like stock android ? :\ i just want let the battery life even better. Recommend please

But to able myself to do that i need to root right ? If anything happens can i unroot and send back for warranty ?