I have an optional feature that requires a bit of setup from the user when its enabled, they have to fill in a form with ~8 fields when enabling this feature. I'm wondering if when the feature gets disabled I should blank the settings out or leave them incase they want to re-enable at some point in the future?

One concern is that some of these settings are a username and password, the password won't be displayed, but If I left the settings intact it would continue be used as the credential when the feature is re-eanabled.