I have some polygons which I'd like to display with their interior displayed at a higher transparency than their borders. Right now, I am doing it by creating two separate layers with the same data source, one for the border (20% transparent) and one for the interior (70% transparent). Actually, I usually end up creating 3 different layers in these cases: one each for the polygon's border and fill, and a third to use in the legend, because neither of the other two will work perfectly in the legend.
Here's an example, in this project I have floodplains set to 70% transparent in the fill (because many other items I'm interested in are in the floodplain and I need to see them), and 0% transparent on the border so that its boundaries are clearly visible. Is there a way to set the transparency of the polygon's border separately from that of the interior, so I don't have to duplicate layers?