Feature Request by TheDaywalker:
Current Blender NifScripts v2.5.8 allow for import/export of existing vert color data which contain RGBA values, but Blender has no facility to display or edit the associated alpha channel.
Proposed idea through topic is to add an addition vertex color layer, a greyscale gradient to represent these values. Possibility for future support to link into node composition system to allow those values to be render for preview
Reference Topic - http://niftools.sourceforge.net/forum/viewtopic.php?f=17&t=3273