Hi Sonic1SVK.
To solve the problem of Miui camera to store images in sdcard, you have to modify the kernel,
flash this modded kernel https://mega.co.nz/#!elQ0RIhD!1x6rrzP4z7YqdgmaUasNtMlt7otGIQV5knskKpTlzU0
images are saved to the sdcard (tested) , files to modify for future kernels are...