Today I have been working on the drawcall minimizer and it is going quite well. For the diffuse textures I can now reduce the amount of textures by combining them onto one texture sheet, after which the texture mapping is updated automatically on the model. The biggest problem with this approach is that other textures (like night textures) are not updated yet at the moment. And also I would like to add the functionality to put the colours into the texture sheet as well to minimize the amount of drawcalls further.
But if I can’t fix those issues quickly, I will release the current functionality soon so that you can also use it. While working on it, I have also speeded up the loading of texture files a bit, this should be mainly noticeable in the material editor.