I realize that when you have a field with the type TEXT, the rich text editor (TinyMCE) will appear. At times, I just want the plain <textarea> to appear. To do that I would use callbacks, making use callback_edit_field and callback_add_field.
And it is troublesome to have to make multiple callback functions for every field that I want it that way.
If there is an easier way, please let me know. Maybe I missed it. But if not, I would like to propose, the field_type() API function also includes the option of textarea.