Leadwerks Engine 4.5 will add ZIP files to the list of file formats you can import into the editor. This isn't really anything special except that it works in a very specific way. Source art files will be extracted first, followed by final game-ready formats (mdl and tex), followed by .meta files, which contain thumbnails and conversion settings for each file. The resulting behavior is that you can import a zip file of game assets, with source art files, and the files will be copied in a way so that no reconversion of the files is triggered, because the time stamps are sequenced in the correct order.
It's the little things.