What I would like to see is default icon image per category able to be set instead of just one default image for all categories.
As an example on my motorcycle site, I have several areas - one of which is ride routes and another which is DynoJet Maps. I'd like to set a default image for each, the ride routes being a map and the DJ Maps being something different. As it is, if there is not an image uploaded, they all default to what I have set as the default (a motorcycle). In the example below you can see where I uploaded a custom image, but my normal users don't do that and it would make it easier to distinguish them each category if it could have a custom default icon assigned to it.