This modification uses the 'Xposed' system, which must be installed as detailed in this post.
This modification will restore the missing 'back button options' in the 'Settings -> Display, Gestures and Buttons' menu on your HTC One. As it is an Xposed mod, it should be ROM version independent.
- Download and install the modification APK - DOWNLOAD
- Enabled the module in 'Xposed Installer'