Default i9505 expand memory, app2sd

Hi, please is there any way, how to expadn internal memory on i9505 16GB CM11 4.4.4? Or enable app2sd function?
I've found partitions for example /dev 904,3MB is empty, /sys/fs/cgroup the same as /dev, /mnt/asec too empty, etc.. etc.. Is there any way how to repartition memory and delete this empty partitions and increase memory for user data? I've only 8,9GB but I foud, this problems have much people with same phone. Thanks