@nman Thanks for checking with root. As for not choosing "mass storage mode" you're of course right - yet, even if one choose to, it *still* works after executing Code: osso-usb-mass-storage-mode-enable.sh /dev/[encrypted-device] MyDocs get just "replaced" on desktop by encrypted volume.
osso-usb-mass-storage-mode-enable.sh /dev/[encrypted-device]
By the way, do you have any idea, how to properly modify osso-usb-mass-storage-enable.sh, to mount lun0 as read-only?
@NIN101 Unless good enough reason (with technical rationale) is provided, I'm not going to re-use Nokia way "because they know better". Anyway, on my device, vanilla osso-usb-mass-storage-enable.sh already set MMC for simultaneous access (that is, don't unmount it), I'm using it like that from the very beginning, and haven't run into *any* single issue.