As the question states.
Can I go back and replay chapters in Story Mode and alter the outcome of later ones?
Let's say I made the decision to save Torian instead of Vette but I later regret that choice.
Or if I decided to release Valkorion's father's spirit but I decided he would be quite handy to have around for the final stand-off against Vailyn
I've noticed that the choices I make by playing through the chapters again on Veteran Mode has no effect on anything - these chapters just play "one by one".