Always Show Custom Field On Cart Page

Hi,

I have a product on one of my sites that is added to the cart automatically using the URL string /?add-to-cart=123 when a certain page is selected. I would like to add a custom field to this product that can be edited on the Cart page. This only seems to show when the custom field has already been filled in on the product page which won’t happen if the product is added automatically. Is there a way to set this up?

I have also noticed that the “double click to edit” feature doesn’t seem to work on the Cart page for me on a Mac. Is this just an issue with a Mac or across all operating systems?

Kind regards,
Andrew