I agree, that was a lot of fun. I kind of wish I could do that with my companions, too. It's nice to romance them, but sometimes I think other pairings would be great, and would love the ability to play matchmaker with my followers.
Although in DA2, this is less tempting than it was in DA:O. In the first Dragon Age, I desperately wanted to set up Alistair and Leliana (as I was with Morrigan), but sadly ... no. I can't think, off the top of my head, who I'd want to see hook up in DA2.