Can you resize any partitions on the MI 4C?

About a week ago, I first ran out of (aka hit 90%) space, and have been forced to let go of some games. Only after doing this, I noticed that my (16GB) phone had just 7.7G in total.
So, I ran df:

Code:

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u0_a91@libra:/ $ su
root@libra:/ # df
Filesystem              Size    Used    Free  Blksize
/dev                  888.7M    88.0K  888.6M  4096
/sys/fs/cgroup        888.7M    0.0K  888.7M  4096
/mnt/asec              888.7M    0.0K  888.7M  4096
/mnt/obb              888.7M    0.0K  888.7M  4096
/sys/fs/cgroup        888.7M    0.0K  888.7M  4096
/system                  1.8G    1.1G  734.9M  4096
/data                    7.7G    7.6G  182.8M  4096
/cust                  310.0M    18.2M  291.7M  4096
/cache                372.0M  332.0K  371.6M  4096
/persist                27.5M  112.0K    27.4M  4096
/firmware              127.9M    71.5M    56.4M  16384
/bt_firmware            64.0M    80.0K    63.9M  16384
/mnt/shell/emulated      7.7G    7.6G  182.8M  4096
/mnt/shell/emulated/0    7.7G    7.6G  182.8M  4096
root@libra:/ #

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Is it possible to modify any of the 4 empty partition sizes?

Running xiaomi.eu MIUI 7 final, have TWRP, xposed and full root.

Thanks.

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