unable to recover email, wrong design of email activation

1. i can register any email that belongs to others, and he/she will have no chance to cancel it
2. i can register with the others' email and name it as something like "sucks", and he can never change the login name
3. no way to recover when an activation email got lost

suggestion: solution a. create user after activation only (easier) solution b. introduce "drop account", account-rename, resend activation email (harder)