It felt Crane too much. Had wanted to have a little bit of Scarecrow in him.
Basically being the judge, he doesn't have a lot of punishments. Only exile (walk on the ice) or death. When Gordon choses death, Crane looks bored and gives him "death... by exile". That part sounded lame. I know he doesn't want to give Gordon his dignity back, so that's why he doesn't give him his "death". But he gives him the exact same punishments as the others, to walk on the ice.
Why didn't he come up with something much worse or humiliating to the traitor of Gotham (Harvey Dent lie)? The chosen punishment was so standard.