A lot of people today will put a blurb in their profile like "I prefer trades under $20 to go PWE, otherwise, use tracking".

The request is to

• Provide a new free form text field where people can describe their shipping preferences, and
• Show that field on the trading page so each user has an idea of what the other ideally wants in terms of shipping

Doesn't mean it needs to be a hard and fast validated rule, but it's a way to bring attention to it in the trading page so people can be aware if expectations wildly differ.