Clear hiden fields only when sending

Hello,
I love your plugin and it works great.
I need my users to be able to change their mind without loosing their filled fields. So I do not use “clear on hide” setting.
But when I send the form, all fields that have been filled are sent.
I would like the “clear on hide” funciton to load only once the submit button is clicked.
How this would be possible ?
Thank you.