Default [Q] Repartition memory layout for Xperia Arc (4.4.x)

I see almost rom 4.4 for my Xperia Arc have been repartition memory layout , as below picture
i743.photobucket.com/albums/xx77/reaflower/Screenshot_2014-07-07-17-51-29.png ( copy and paste to your browser's address, newbie cannot post link)

/data: 470MB
/system: 450MB

Can anyone change to
/data: 570MB
/system:350MB

It's quite waste memory while still have not enough memory to run Art runtime.

p/s: i'm using Pac-rom 4.4.4