If you want to do your own campaign with custom briefings and wins, you can do that right now. The way you do it is to create your level, save it, copy the level out into notepad and then edit the file by hand to add scripting/briefings. To give people examples of how to do this, I’ve uploaded the 4 tutorial maps. You can download them and then save them to see what they look like.
Be careful. When you add scripts, it overrides the default script so the win condition is now entirely in your hands. If you have other questions or have troubles, ask and I’ll try to help out.
Level 1:
http://auriga-squad.appspot.com/get/agxhdXJpZ2Etc3F1YWRyCwsSA01hcBi8jAkM
Level 2:
http://auriga-squad.appspot.com/get/agxhdXJpZ2Etc3F1YWRyCwsSA01hcBiquAoM
Level 3:
http://auriga-squad.appspot.com/get/agxhdXJpZ2Etc3F1YWRyCwsSA01hcBiQ7QgM
Level 4:
http://auriga-squad.appspot.com/get/agxhdXJpZ2Etc3F1YWRyCwsSA01hcBjr_wcM
-Jonathon Duerig