Allow the use of color ramps when symbolizing polygon outlines. Currently one can only change outline colors one at a time. This is extremely time consuming when dealing with more than 3 or 4 unique values in a category.
I would also add that it should be easier to visualize data combining two attributes. This is relevant not only to polygons but also to lines and points. Combining two attributes is solved quite well in ArcGIS Online but it lacks flexibility in ArcGIS for Desktop. For instance, I would like to make a map with point data and visualize it with different colors and symbol sizes. At the moment, I am able to do this manually by picking the color or symbol size for every category.
This has been a fairly annoying issue for my colleagues and I over the years. It isn't available in ArcGIS Pro 1.3.1, either.
I'll add my two cents and propose a similar thought--how about a color gradient be developed as a symbology option for the inner edge of polygon boundaries? This is currently allowed by using Representations, but I think it would be a great addition to the mainstream symbology dialog so the same effect can be created without modifying a feature's schema.
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