Scepter’s auto is pretty horrible.
I actually use the Scepter for 2 things:
Hitting bugged targets, like some buildings and contraptions who won’t take a hit from my Mace. The ranged auto-attack wont miss(as much).
Trying to get some XP out of a overwhelmed event. If there’s 20 guys running around in the same event I’m participating, chances are, my Norn legs won’t even get in time to the fights. (like centaurs rebuilding a bridge) So I try to make myself usefull by hitting them from affar with the varius skills.
So for me Scepter can be used for very specific questing too.