General :: Sony Xperia Tipo - Merge Device Partitions

I have SONY XPERIA tipo with 803MB Internal Sotrage and 2.20 GB.

I have rooted the phone, and set external 32GB card as the default SD card (i.e. phone thinks its internal memory is 32GB) via changes in /etc/vold.fstab file.

The result is that phone regards the 2.20GB space as external memory.

I can move many applications to 32GB card, however some applications e.g. BusyBox, GCC Toolchain, and Chrome are not movable to Internal storage (32GB) or external storage (2.20GB).

Since the 2.20GB space is of no use for me, and it is mounted under the same device where "phone memory" 803 MB is mounted i.e. :

/dev/block/mmcblk0 = 3909 MB
/dev/block/mmcblk0p11 = 524 MB
/dev/block/mmcblk0p11 = 167 MB
/dev/block/mmcblk0p15 = 803 MB
/dev/block/mmcblk0p16 = 2311 MB

Surely, the last partition "/dev/block/mmcblk0p16 = 2311 MB" is the free storage not being used, and "/dev/block/mmcblk0p15 = 803 MB" is the phone memory, which I want to extend/increase.

My question is: Is it possible to merge the alst 2 partitions (e.g. by formatting 2.2GB space and then merging it with the 803MB space. This way my phone will have its system memory pretty large, and I will be able to install more applets through BusyBox as well as Chrome etc.