I confess to not knowing much about Langford, part of the reason I enjoy taking part in the discussion group. But St Clair was always a course I found different than most, almost quirky, but it a good way and I knew I liked it. Since joining the GCA board I was surprised to see there are many devotees of his.
From what I've read on these posts, St Clair definitely has the "half-par" concept. Number 5 is a 260 yard par 4 with OB left and right. Number 6 is a very reachable par 5 (assuming you drive the ball 250-260). Many more examples on the back.
9 and 10 are back to back par 3s. In fact the par 3s do not have a lot of variation in yardage, but they do in elevation, which forces you to use different clubs. Number 13 is a straight up the hill 3, and requires 2 extra clubs. There are several push-up greens on the back, but I wouldn't say that is a prevalent feature on the course. Rolling terrain.
I am due to play it next week and looking forward to seeing it post renovation. Kye Goalby did it who I believe is an associate of Tom Doak. I hope the result was restoring it to its original design.
I'll try and post pictures since it seems this work is relatively unknown to our GCA community. As I've mentioned before this is the home course of Bob Goalby and the Haas boys.