Just a little note to let you all know that the PyPrp blender plugin has some new functionality.
A few weeks ago clickable objects support was already added for those who do not know already.
And the new addition is a texture cache for exporting - processed textures can be stored in a cache directory so future exports can be a lot quicker.
So the need for export and re-import is becoming lesser and lesser.
(Ofcourse, if you update a texture, you'll have to remove that texture from the cache.)