[Q] Tap to wake without root? topic

I wanna unlock my phone or wake up screen with double tap.I been waiting for this expecting that i will get option in kitkat but i updated phone last night on kitkat and no wake up option....so dissapointed tbh...Anyways i tried wake up nexus i tried tasker and touch pro and those bug my phone big time.Is there any solution or i will have to buy stupid Z2 because this really annoys me ><