yes. you can get better performance with custom kernel.
many features has been added.
and sometimes you can overclock it.
i can say that lupus kernel is quite stable right now.
wanna give a shot?

I think better you go with UHD.
the camera mod is very nice.
sometimes I just think to reflash the GB back.
but still stick with UHD because of the modded camera.

ahh yes.
you right.
must do from the start...again.


that's why I use custom kernel.
they've got recovery already.

here.
at this post.

then you must unlock your bootloader.
use a copper wire or test point.
you can refer to original article how to unlock with test point.

yup.
sure they got MTP mode.

flashtool is very easy to use.
trust me.

just go to setting>xperia>connectivity.

all links seems to work for me.
except xperia pro 4.0.4 kernel at slingfile because the file was deleted.
it's my file actually.
LOL.

it will not harm your phone.
the script just get aborted.
just try run the script again.

lol.

if the root is success.
superuser app will appear at the home launcher.

make sure to untick the wipe data and wipe cache while flashing back the stock 4.0.4 kernel.

how to untick that anyway?
when rooting keep come out "error: device offline"
how ar?

strange.
   

wow.
really?

i'm rarely used the keyboard right now.
get to used the swipe keyboard.
easy and fast.
LOL