Path field in template editor does not look editable

In the template editor (aka document type editor), when adding or editing a field, you get a number of text boxes on the right side of the screen, to edit the field's properties. They all have the same look and feel, and are immediately recognizable as editable text fields, except for one: the "Path" property. At first sight it looks like it is not editable because it is not in a text box with a different background color. Only by clicking on it you find out that it actually is editable (or when you add two fields of the same type and the template won't save because of conflicting paths...).