Hi! You should be able to export all of them! The 1.04 update added an export all/apply to all button! When you press apply to all and then export all and choose your export folder, everything should work! ^^ Good idea with the dithering value! I totally missed it, I was placing all of the options by hand since it's in unity x3
Hi! I've added the dithering strenght number in v1.07! As for choosing many textures, sadly you can't yet! You can export any of them already loaded, but to actually load them in bulk, you would have to get them into a separate materials attached to the model. I'm working on adding the ability to choose multiple files during texture import!