Officially away fans aren't allowed in at all, according to Saints. They say one thing though but actively accept bus loads of away fans sums Saints up.
I don't think it'll come to anything as while folk were a nuisance, that's all it really was. Although one of the staff did say to me they "hate" when it's Aberdeen because "they're always horrible" so maybe it isn't a once off but I've never noticed anything before .