There used to be two runs on each course for individual parallel at the start of this event but it lasted too long for TV window so they scaled back to one and it's been unfair 9/10 times since. Obviously they could introduce two runs each again only if men & women would have separate venues which is unlikely to happen.
As for team event, technically they are alternating the courses. It's a question of figuring out what is the winning formula. Here in Beijing it was to put your best two skiers on the blue course. Surprise, surprise... eventual gold medal winners Austria did just that - Liensberger & Brennsteiner raced on blue course in QF, SF and Final. I do wonder if Austria noticed that pattern after 1/8 when they had a bye. Total times from two winning runs on blue ALWAYS decided every tie. The gaps to red & DNFs on red were irrelevant.
If USA put Shiffrin on blue in SF they would make the final, if they put her on blue in small final they would win bronze. They got lucky de Aliprandini crashed on blue course in QF but it was criminal to keep putting Moltzan on blue after that.