Ok, so briefly.

Export all terrain associated textures seperately as bmp:
Blendmap 0
Blendmap 1 (If 8 terrain textures used)
Shadowmap (RGB or Greyscale)
Textures 0 - 3
Textures 4 - 7 (If used)

Export water plane as hmp
Export associated water textures

Not too sure about the skycube aspect. Seems as though there are many other apps for generating skycube stuff?

If dds is checked I will still put the dds filnames into the relevant hmps (still keeping the files as external) as this allows me (anyone) to just export and run the game without having to do anything else.

If you keep the textures packed the way I do then you can have

1 x blend map
1 x shadowmap (8bit)
4 x terrain textures
4 x terrain normal maps
4 x greyscale detail maps

all packed into 8 textures.


Regards

Justin