I'm using the "extra1" field for the user's physical location across all ad types.
I have it listed next to the username in my category listings:
Content visible to verified customers only.
How do I go about making this extra1 field a "required" entry just as the zipcode entry is required?
Would this be an uploadproduct.tmpl edit or a mod to the uploadproduct.php script?
It would even be great to pull their location from their vBulletin profile as a default.