Ask before making a phone call or FaceTime call from...everywhere (I think).
Ask before sending SMS/MMS/iMessages from the Messages App.
Ask before sending email.
Turn on CallerID blocking on a per phone call basis.
You can add contacts from your AddressBook to a Whitelist, which will disable AskBeforeCalling for those contacts or you can Whitelist all contacts.
KNOWN ISSUES
When using the experimental option to ask permission before replying to an iMessage Notification, the keyboard will probably disappear when the alert pops up. You will have to tap the text input field to show it again.