Even knowing that Lumo is opt-in and that I don't have to use it, I would still appreciate the option to customize my apps and remove Lumo from the default options that appear beside Mail, Calendar, etc. It would be ideal to have a section in the account settings that allows you to manually disable all Lumo functions, and even disable the ability to access the app if Lumo is disabled via your account settings. I know that I don't have to use it if I don't want to, but I also don't want to see it if I don't have to, so I don't have the feeling that a product I'm uninterested in is being pushed on me relentlessly.