I guess I feel largely the same way -- although I'm not sure whether it's altogether reasonable of me to give greater credence to a pre-HBP speculation on Tom's mother that happens to get written afterwards than someone going off in another direction afterwards.

Time's Riddle we had a bunch of other stuff half-plotted, but Stepbrothers... I think kind of hit a stopping point, if not exactly an end. Most of the remaining ideas dreagoddess and I had for that one were more about how they ended up as adults.