It would be helpful to have some spacing and padding options in the wireframe diagrams. Especially in case of tables where the text actually touches the border. This can be seen in the example from the official document:
http://www.plantuml.com/plantuml/uml/SoWkIImgAKxCAU6gLkRIKwXHSCxFAStDKp12C8svWlBB5J9I4rDIYnGCWU9bYJcbgKWi8sG588sE2ZdvUUaAoQavEK2U5bSjbqDgNWhO5W00