I've added a custom textarea for the create/edit post admin page. I did so using the add_meta_box() function. The problem is that the add_meta_box() callback function (which saves the data input into the textarea) calls the update_post_meta(). update_post_meta() then adds a custom field within the custom field section. So you essential end up with two textareas for the same field! The one you've created and the auto generated one!
Is there a way to remove the auto generated custom field?