Default [Q] possible to change the back button?

I have a Z1,but what annoys me is the back button order.
It is on the left,and if i want to go back it is almost impossible to do with my right thumb and mostly i have to use my left hand to pres it.
My previous phone was a X10 and the buttons on that were just ideal.
Is there any way to change the order of those buttons?
Also its a huge mis that Sony didn't place those button on the black area on the bottom of the phone! if they did this right, this phone would be perfect!