Apologies for the title confusion. For those who don’t know, to disable the mipmap feature you have to pull down the top menu bar and go into the “System & OpenGL” option, then find the mipmap button and click it off.
This will only cause more problems however with lines and fine detail.
The only option I could find to lessen the impact of the mipmap edges is to make your textures as dark as possible with the least amount of contrast that you can get away with. That way the effect is more subtle. Otherwise, if you click it off, you will have to skip giving your scenes any real fine detail, because it will look terrible.
So far, I haven’t found one free software that tops Blender when it comes to game authoring. I like the concept of mipmapping. However, I just wish I knew how to refine this particular feature a bit more, as it would do wonders if there were no sharp edges to worry about.