FR: Override / access code - configurable random

[woj-tek]

Hi,
would it be possible to add two options to override options:

1. variable random string lenght (currently only 32, 64 and 128)
2. set of characters (A-Z, a-z, 0-9, special characters)

I'm aware that it's supposed to be difficult but with currently generate password I tend to disable LB altogether to bypass the limits, but it also removes any timers that would prompt me to stop.

This is somewhat inspired by KeePassXC password generator: