Tonight an agent waitlisted a Lufthansa First segment for me. Only LHR - FRA was available, but she put a request in for "O" space on the LH TATL segment I had hoped to book.
I was skeptical it went through but united.com does indeed show the LH TATL with red lettering underneath saying "this flight segment is waitlisted."
I set up an EF alert anyway, but it'd be cool if it clears automatically.