Add comments to the vars to explain what they are/do.
Add a reminder up top that we've got this, and actually use the member variable instead of an extra call to get_option!
Convert from using many options to a single serialized options array. No upgrade path, as this hasn't been publicly pushed yet.
Add an explanation and change the verbiage to the new user override.  It can be a bit confusing.
Correct the textdomain for a translation!  Oops!
D'oh, needs to be accessed as array, not object.
These are checkboxes, so don't check for empty, just check for if they're set.
Change the secret to a text field, not a password field, so Chrome's obnoxious autocomplete will stop trying to load a username and password into them

http://core.trac.wordpress.org/ticket/24364
Add the regular-text and code classes to the text inputs.
Add in the match_by_email toggle.