Well, there are several great things about "white glue". Since it dries clear, you can use it to simulate the glass over cockpit insturments, landing lights, etc. The best thing about it, for me, is it won't fog clear parts. I use white glue to attach canopies and wind screens. If you mess up, it cleans right up with water. It is also useful as a filler, especially around two piece canopy frames that just don't line up, filling small cracks and such. I find it valuable on armor models, especially when I am applying custom poses to figures around the tank. I use the white glue to "temporarily" pose my figures, so I can get them just right. White glue works great for filling in vision blocks too. If you're making flags or tarps, blankets, etc, you can coat tissue with white glue to get that realistic effect and paint right over it once it is cured.
Steve