Additional functionality for the cart addon

I have a request for additional functionality for the cart addon.

●invoice page
・A button to remember the form
・To be able to select not only input but also textarea for the form (e.g., Message that is several lines long)
・Form content confirmation page

・Basic price setting
・Shipping cost setting corresponding to the Album Set.
(I want to change the shipping cost for each album set).

Please consider this matter.