The ability to add labels over uv tiles so you can quickly label which uvs are for what objects.. Can create text and adjust it over the uvs however, it can not be selected or show up in uvs when you export out of maya into another software. Or finalize them. I find this would make it easier to at a glance see what you are about to uv...also, you should be able to color code each uv box with different colors so as to quickly distinguish and select the right objects when going into the viewport to the uv editor...