Not sure which category to pick for these questions, as none of the choices seemed appropriate or specific enough for the Texture Tools.
The older Plugin for Photoshop CS to export DDS files had many more options for filtering Mip Maps, such as fading to Black or White down the Mip Chain. It also allowed Photoshop the expand the Mip Chain, allow artists to change the contents of the Mip Chain and then re-save the changes back into the DDS file.
From what i can tell the newer Texture Tools lack both capabilities. The Mip Map options are very basic compared to what was previously offered, and opening a DDS with Mips into Photoshop now puts each Mip into its own Layer, which does not allow for modifications to be saved back into the DDS file.