The duress password feature is useful and it would be nice to be able to set multiple duress passwords.
Here's a use case:
when someone tries to unlock your graphene phone with your other device's passcode
Here's where duress passcode 1 kicks in
When someone tries to use random weak password to unlock your graphene phone
Here's where duress passcode 2 kicks in
If all the tricks don't work, and you're forced to tell the password of your graphene phone
Here's where duress passcode 3 kicks in
For me, I have an other phone for daily use, and graphene for secret things.
If I were asked to give the password of my daily phone, I will tell.
But if they try to unlock my graphene phone with the same password, the data is wiped, and you don't face charges of destroying evidence