Ok, here is the link to the first feature suggested: https://blueprints.launchpad.net/ubuntu/+spec/ubuntu-installer
I haven't found where to request for the second one. However, since, as I assume, people responsible for update-manager are subscribed to this bug, they were already notified of it. Anyway, I would like to hear their response in this thread.
ryanmbruce, I have already subscribed you to the blueprint. And thanks for your support!