Enable on-screen buttons

As I don't like the default button layout, I enabled the on-screen buttons and disabled the hardware buttons.
In case someone wants to do that, too, I thought I just post the instructions here:

1) Enable on-screen buttons
Edit the file /system/build.prop and add the following line:
qemu.hw.mainkeys=0

2) Disable hardware buttons
Edit the file /system/usr/keylayout/ft5x06.kl and comment out the following lines:
#key 139 MENU VIRTUAL
#key 102 HOME VIRTUAL
#key 158 BACK VIRTUAL
#key 217 SEARCH VIRTUAL

3) Reboot

Tested with CM11. Not sure if this would work on MIUI.

Thanks @chris5s and several other forum users. I know that there are a couple of similar posts for other phones. But I still hope this is helpful so that Redmi 1S users don't have to look in another place.