Default On Screen buttons?

As the title says.
Is it possible for us to get onscreen buttons on E7 ?
I come from a nexus and i find them much easier to use and also the target areas for capcitive buttons are tiny and i keep missing them.

I tried to do it with root explorer but didn't work couldn't save the file can someone please tell me fi its possible .
button bezel is very tiny and screen is huge i wouldn't mind losing a little screen estate.