So if the user enters their e-mail as part of the form that's submitted, and the administrator gets a notification, could that notification's "reply to" field be from the e-mail that was submitted?
This would be convenient because if the person notified wanted to reply to the user, they'd just hit reply, instead of having to copy/paste the e-mail into the e-mail field.
Currently notification "from e-mail" field is always set to the e-mail address that's set in Admin / Email Config / Return email address for auto generated emails.