Was searching how to disable the intro movies and stumbled upon a few more interesting tings.
((nwn.ini is found on the .exe folder, and should be edited using a text program, like notepad.))
[Video Options]
Grass Far Render Distance=900.0
This sets how far into the distance grass should be rendered. Valid values range from 900.0 to 30000.0, with a default of 900.0. Increasing this value will cause more grass to be rendered in outdoor grassy areas, but will also reduce game performance in these areas. (Added in patch 1.69.)
Source:
http://nwn.wikia.com/wiki/Nwn.ini
