Well that will be my first project with this thing if I get one. I'll get a price on the titanium backup camera, then see if I can find the hookup behind the hatch panel. I'd be shocked if it wasn't there. I can't see how ford would make a one off wiring harness for the ST model that will only be around for a year before they have to put the backup camera in. I just have to believe it's the same interior harness as the titanium, which means that hookup is back there (or in the car at least) somewhere.
Pretty sure the parts guy Tousley Ford wrote on one of the Focus forums it is different..... I may be remembering wrong but I will try to find it