Thanks for that clarification!
Though on second thought – as your OP still contains all three requests and the conversation we now had also doesn’t add to that other feature request (Passwort Generator for Hidden Custom Field) directly, I’m going to close this feature request (with a short delay).
Please then join Passwort Generator for Hidden Custom Field with “B” – and open a new feature request for “A”. Please do a search for “C” as there also might be an existing feature request for that already - at least for the “generator rules”, but maybe not for the connection to (hidden password) custom fields…