Enable capacitive buttons on CM11 (or reduce NavBar)

Hi all! I would like to know how to enable the capacitive keys on the s3 mini with cyanogenmod 11 (KitKat). it's a bit annoying using the navigation bar (qemu.hw.mainkeys=0).
they worked with the samsung firmware.

(otherwise I would like to reduce the navigation bar)

I've also notice that I don't have this file: sec_touchkey.kl under /system/usr/keylayout

Thanks for the help.