Yes it was an option on the ST, possibly part of a pack giving you auto wipers plus auto headlamps and maybe the dimming rear view mirror also.Did they ever come with auto wipers?
Later on for the mk2.5 they added more features to standard specs and took them away as options - 2010.25MY ST3's for example came with privacy glass, climate control plus auto lamps/wipers/dimming mirror as standard spec.
With the ST you are looking at does that not have climate control built into the high spec nav/touch screen system it has?