Hi Fillius,
1. If you're creating a subaccount, you don't need a new email address. Just go to "Manage subaccounts" from your profile page and you can create a new account without having to provide another email address.
If you're creating a new account, yes, you'll need a different email address.
2. Yes, of course. You can post his application in Elsewhere forum.
3. Esme passed on the message, we'll let you know shortly through PM.
Thanks!