Root without custom recovery
is there a way to root the device without custom recovery? After returning 100% to stock (I was on stock rom, custom kernel and custom recovery but I'm back to stock for receiveng sense 6 update), battery drain is much higher (same apps installed, no damaged mp3 causing mediaserver drain, checked all option of all apps ecc.. I tried everything) and, without root, apps like gsam or better battery stats don't help so much...
I'm on m7_ul, 4.4.2 stock rom (sense 5.5), s-off and unlocked bootloader