There are a number of sites out there that do this, such as DeviantArt and Weasyl, so I don't see why FA wouldn't be able to as well. Reasoning behind this is; it's often very difficult for artists and commissioners to decide on what piece in their gallery they like the most. Some might have multiple favorites! And having only a single submission be able to be featured means they have to choose one and shove the rest aside, or manually cycle from one image to another in their settings every once and a while. An easy fix for this would be to create a folder that submissions a content creator wants featured can be put into. Then, whenever someone loads up his or her userpage, RNG would be used to decide which submission from the featured folder would display in the featured submission area!