Create a specific rule for labeling in the "lable with" field export the entire layer style to a qgis layer style file (qml) Create a new layer, import the style, the Label with field is not filled.
Larry just committed support for label shields in upcoming QGIS 2.0. That's a fantastic addition. To complement this, it might be nice to add a couple of label-specific shields (roads et cie) in the ...