I'd love to see a low intelligence options in NV. Having special; dialogues, miniquests, and maybe a unique companion.
Just a n example of :
The Doctor: Without the positron stabilizer, the antimatter generator will create a matter-antimatter reaction making an explosion that's equal to a 20 megaton thermonuclear bomb. That's why I need you to get it before I can restart the generator. You'll recognize it by the electromagnetic array, it looks like a series of tubes surrounding a metal cylinder,
PC(normal INT): Easy, I'll be right back with it!
Pc (Lower then 3 INT): A popsicle stable, for a magnum? Wait what was it again?
The Doctor: ... Here's a picture of it , let me pin it to your shirt. (picture added to inventory)
And with hight INT you'd say something really eggheadish
PC: "Yeah, I know what that is. It's a [blah blah] used for [blah blah]. Are you sure you can use it though without a [blah blah] or should I try and find that aswell?
Doctor: *stands in awe*
Replace [blah blah] with science stuff. You could say that I'm around 5 INT in real life so... I couldn't make up anything good

So basically there should be three different dialogue options:
One for dumb characters,
one for intelligent characters,
and one for "Average Joe"-characters.
Edit: And if one has not watched Idiocracy then one should watch it! Could inspire you how Low-intelligence characters would be like.
http://www.youtube.com/watch?v=y0O7_3o3BrI