In theory, you could probably use some of the ext4 resizing tools to do something like this, but I haven't looked into it as there isn't much point in the current config (since the LVM userdata volume is allocated to use all space on the volume group).
Something like that might be more useful if someone ever uses LVM to regain some of the wasted /system partition space on certain excessively bloated devices (like some GS4 units).
Android has supported emulated storage (where /data/media is mapped to /sdcard with a special FUSE daemon that makes /sdcard have DOS-like permissions despite an underlying ext4 partition) since ICS. It's pretty much the standard in all new devices - the Find 7 is to my knowledge the only device launched in 2014 not to use emulated storage. Most devices in 2013 also did - Oppos were again the rare exception.
As I understand it - for some reason Chinese users prefer the legacy pre-ICS partitioning scheme. My guess is due to UMS vs. MTP - MTP is required for access to emulated storage, UMS can't be used, but a lot of older desktop OSes have issues with MTP. So Oppo finds themselves in conflict between their home market (China) and expanding in the West. That said, the Find 7 was kind of a screwup in achieving this goal, since the internal sdcard partition was ext4 which meant UMS was a no-go for it.
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