Register Biometrics iOS vs Android

[fraserbooth]

When using the Register Biometrics function, on Android there is always a "popup" confirmation asking for biometrics again, while on iOS there is never a "popup" confirmation. I realise that its possible to force iOS to mimic Android simply by calling the .show function. Is there a way to get Android to mimic iOS, as it hide the popup when using register? I want to use the biometric secret as a secure key which gets updated periodically without needing the user to authenticate each time I update it.
Thanks for any thoughts on this :)

[fraserbooth]

I've just discovered this is a repetition of #327, but that was from a previous version. Maybe there is an update :)