If you do not want to require the Merchant password for manual tip percentages that exceed the terminal's threshold, you can disable the tipping threshold.
NOTE: The tip threshold feature is designed to protect the customer and the merchant by ensuring that the customer is fully aware of the tip they are leaving. If you disable the threshold, you leave yourself at risk of the customer contesting the charge if they do not remember leaving the tip. The Merchant password requirement provides protection from future chargebacks.
To disable the tipping percentage threshold: