Here is my first python script.
It allows you to make your textures all pixelated/unpixelated with one click!
Caution! This applies the change to ALL textures. It will change Interpolation and Filter Mode.
It also lets you set materials to recieve transparency with shading. This makes it so that transparent textures won’t cast shadows. However, I believe it may increase render time. Not a big trade off for quality 
Download:
M3Tools.py
To install, drag it into your blender’s Scripts/Startup folder.
I found it very difficult to change these settings when dealing with lots of projects. This tool has helped me greatly, and I hope that it helps others that need pixelated textures/materials that recieve transparency with light, but don’t want the work!