border.bottom, border.left, border.top, border.right: fp_border for borders. overwrite other border properties.
shading.color: shading color - a single character value specifying a valid color (e.g. "#000000" or "black").
keep_with_next: a scalar logical. Specifies that the paragraph (or at least part of it) should be rendered on the same page as the next paragraph when possible.
tabs: NULL (default) for no tabulation marks setting or an object returned by fp_tabs(). Note this can only have effect with Word or RTF outputs.