hmm, maybe it's possible to save your created missions local on your harddrive. so first you don't really loose your mission if you delete it from the web-foundry. maybe it works like the costumes you created: you only have 3 slots but you can always save them in the sto-folder on your computer.
i mean at least you could change your missions time by time.
Hmm, even if you could save it to your local hard drive, it still bothers me what happens after they're removed from the server.