Option to set an alternative passcode ("double bottom") that either opens a limited set of chats, opens a different account, or destroys one of the connected accounts completely when entered.
Use cases
Could be used by political activists in opressive countries when they are required to unlock their chats.
Potential issues
If such an emergency passcode is set, the app won't be able to use your fingerprints or other biometric data to unlock chats. As a result, the absense of biometric unlock could be used a clear indicator that a person has something significant to hide – and it becomes impossible to prove this is not the case.
This might provide a false sense of security and might actually make the situation worse for an activist's or an innocent bystander.
I think it'd be wise for Telegram to implement this since WhatsApp has implemented this feature!
Ludovico
Also i would add the possibility to request a pin code before selecting a given account leaving all the others unlocked. And also the possibility to hide an account and unlocking it for example texting a code in the saved messages
And like suggested in that document, there should be an option to use different, consistent colors or ascending gray scale for the different keys, like this:
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https://par.nsf.gov/servlets/purl/10028981
different, consistent colors or ascending gray scale for the different
keys, like this: