Eliminate EmptiesSome assets create empties that are not really useful in Blender but mostly in the way. A typical example is this jacket with buttons, where each button consists of a mesh that is parented to an empty that is parented to a bone.
The new tool removes this extra layer of empties.
Other vendors implement jacket buttons as empties that are instanced to a mesh. Instanced empties are important because they show up in renders, and therefore the Eliminate Empties button does not remove them.
Import Custom JCMsThe Import Correctives button imports Joint Corrective Morphs (JCM) for the active character. The Daz Importer has a build-in list of locations where it looks for such morphs, depending on the character type. This means that it will only find the standard JCMs provided by DAZ. However, some vendors provide custom JCMs for their character. This is especially the case for monsters that deviate significantly from the standard character that they are based upon.
You can also load JCMs with Import Custom Morphs. That is not really useful, however, because then the shapekeys are driven by rig properties rather than bone rotations.
Transfer correctives should work for both standard and custom JCMs, since it transfers shapekeys driven by bone rotations irrespective of their origin.