I submitted my Spouse application today, I had the same doubt, called CIC, they said I would need to sign and get signed the applications, I asked the logic as I never signed online applications before, even for my EE Profil, they said it's my spouse's application also, and she doesn't have a history or no old applications, she would need to sign her part at-least... However I did all that, but still think that some maybe in online, if there isn't any sign, it might work yoo