As far as I know, it had that capacity from the get-go. I've seen videos and corporate blurb from its launch date to that effect too.
And having a full crew just meant you had three people twiddling their thumbs, rather than two :)
However, it was essentially never used.
That is, it had the technical capacity to land itself, but the crew typically only landed it manually.
Interestingly, I saw somewhere the other day that apparently, even on current kit, full auto-landing is only used in conditions of zero visibility. Counter-intuitive at first blush, but then I guess it makes sense -- humans get disoriented in such.