This functionality is not available by default but yes it is possible with small overriding. Previously we had a detailed discussion here why we should not add email field in ask/answer form (you can find it by searching).
Any way I can help, let me know 🙂  -Chad
I will think about it.
You deleted site admin? I think you have to create page again as after deleting user the page created by previous user is gone as well.