When using two or more fields to symbolize a layer, if only a few values for that field need to be drawn different, it would be nice to have the remaining permutations for that field the same.
For example: A pipeline feature class with one field for product type (gas, water, etc.) and another for its exposure (above ground, on ground, partially buried, buried). The goal is to have each product type a different color, buried to be dashed and all other exposures solid. With a single unique values render, we could add one value for buried and make it dashed and then use <all other values> for the solid, but need to add in the color… With a many unique values renderer, we can then set the color for the product type but have to call out each exposure even though 3 of the 4 share the same color and solid line. Would be nice to be able to create symbology values along the lines of: gas, <all other values> gas, buried water, <all other values> water, buried