Hi Markus!
Thank you for your feedback. Used your plugin in the times Nuki didn’t have native HomeKit support!
The devices are actually implemented as LockMechanism, which means that Siri on iPhone/HomePod requires an unlocked iPhone. I agree that the switches for RTO and continuous mode could be seen as a security risk, however, they are not enabled by default in the configuration and are not directly performing lock tasks. Both switches could also easily be implemented as LockMechanism…I should make this configurable.