Allow variable length passwords instead of / besides pin code

Is your feature request related to a problem? Please describe.

Currently the pin code setting can only be 6 characters long, I would like to set a longer code to increase security .

Describe the solution you’d like

I would like to have a normal text field instead of 6 boxes for entering a pin code, this text field should allow any unicode characters at any length for protecting the keychain phrase

Describe alternatives you’ve considered

The text field could maybe be an advanced option besides the current design