I'd like to see the labeling engine have the capability to only label features within a particular boundary. For example, I want to label only the roads within one county, but have them symbolized in the surrounding counties. To do so currently, I have to clip the roads layer and use the clipped for labeling and the full extent for symbology. However, this clutters the layer list, the legend list, and the geodatabase. It would be awesome if the functionality in clipping or select by location could be used within the labeling engine! I'm currently using ArcGIS Pro - but I don't remember that functionality in ArcMap, either.