The 22-year-old Newcastle Knights winger scored one of England's nine tries and laid on others before half-time for his centre Kallum Watkins and captain George Williams to press his case for inclusion in the tournament opener against Samoa at St James' Park next Saturday.
With right winger Tom Makinson set to face Samoa after being rested for the warm-up game, Young is thought to be vying with veteran Ryan Hall for the left-wing spot.
Wane says his mind is mind up, admitting the former Huddersfield player has "a good chance".
"I thought Dom was good," Wane said. "He carried the ball strong and his skill was good. Overall it was a great first game for him.
"He's done some outstanding things with Newcastle this year but the thing that impressed me most was his carries out of yardage - that troubled Fiji.
"He's been great in camp as well, he's fitted in well, I've been impressed by him.
"It definitely makes my selection harder. It's going to be a good week this week, I'm looking forward to it.
"All three are great wingers, that's my job (to pick two), have to win that game next Saturday.
Williams was also impressed by the young newcomer, saying: "He's a freak of nature, big, strong fast. He set me up for a try so I owe him one."
England led 28-8 at the break and, although they lost some cohesion after Wane emptied the rest of his bench, the coach was well satisfied with the display and said the squad had emerged injury free.
"It was very impressive with the conditions and players not knowing each other that well," he said. "Some of the skill we showed was really impressive.
"Our defence was good. They're a big physical team, although I know they had quite a few missing, but we very patient with the ball."
Fiji, who had former Leeds boss Brian McDermott in their coaching box, were semi-finalists in each of the last four tournaments but will need a drastic improvement if they are to trouble Australia in their opening game next Saturday.
They rarely looked capable of breaching England's watertight defence and their misery was compounded by injuries to Brandon Wakeham, Joseph Ratuvakacereivalu and Kylen Miller.
"There's not much to take out of it," admitted McDermott, who says he was asked by Fiji coaching director Dave Furner to step in in his absence to provide valuable experience to the backroom team.
"I'll look at it again to see if there are any positives but they're hurting. It was a really disappointing performance and they know it," said McDermott.
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