First - The ability to remove weapons or shields during previewing. I do not like closing the preview window and then having to remove a weapon or shield and then return to the previewing window.
Second - If we could use the preview feature when inspecting someone and when trading to try out accessories on other people and ourselves.
I'd rather get something bigger than this but with the major focus of SK being moved to prize boxes, features like this become far less trivial than they seem.