Default [Q] 3 Hardware Buttons Support

Hello,

I am pretty new to this FirefoxOS but I think I know a lot about Android.

Today I found a official build of FirefoxOS for Huawei Y300-II or Y300-F1 I'm not sure. I flashed it on my Huawei Ascend Y300 (old one with android) and it worked flawlessly untill I found that only Home button works.

And I would like to make atleast my Back button work. I was alto thinking - when I extract System.img it has some files same as android and one of them is /usr/keylaout/generic.kl. I compared those two files and they seem to be pretty same.

So will FirefoxOS ever have support for 3 buttons phones? Is there already a 3button phone from where I could try to port support for it?

And also what files are used to control sound? Because it doesnt work either.

Thanks and sorry for my english.