Be aware that this feature does not prevent a devices for being detected by sniffing the radio traffic, because the normal data traffic is still there and not encrypted in any way. An Encryption would hide the sender address. This would make it again more difficult to copy a sender address and simulate a paired device. (This is stikk possible now). But again, this will come later, maybe!
The best solution is to implement an encryption feature at a higher communication layer.
Marcel Schulz