My biggest wish would be for a library system that allows multiple libraries to be open at once, and true drag-and-drop for importing props & characters, and for applying poses, MATs, Textures, and mateials to objects.
I know there are a couple of utilities that support this, but they seem to rely on NET to work, and NET doesn't work on my system no mater what I do.
An item specific  "Drape now" command for dynamic clothes with directional gravity would be good, too.