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Right now, the only display type options for attributes are "text field", "select box", and "radio buttons". Adding "text area (multiple rows)" is a very simple task—simply adding another option to the _uc_attribute_display_types() function and fixing a few references in the attributes module where it references the type index. I am submitting a patch which adds textarea support, and I've tested it on the 6.x-2.0-rc3 version. Works great.