I will investigate your lock tag detection issue as this should work properly. It could maybe be an issue with this specific reader I will give a try as I also have it.
There is indeed no encryption on stored data for now but this will be quickly added as it is not a technical issue. Beep is a default feature that cannot be disable on current configuration UI but maybe it will just be disabled by default depending on feedback.
For additional information about NFC reader type, acr122 can work as a PC/SC reader or as an NFC reader (technically, it's libnfc supported readers here in this case). But on Windows it requires specific libusb driver installation so it's generally preferable to use PC/SC.