Better control of who skates out when you have an extra skater would be nice. Or at least a revamp of the system so that the AI picks the person with the higher shooting stats. Last night, down by 1 with 1:30 left, I pull the goalie to get an extra skater...who comes out, but Steve Ott...(not entirely unrealistic, as Hitch has put him on the PP before). Whatever, not that bad. Anyhow, next line comes out, and who's the extra skater this time? Oh, scoring legend Brodziak...fine. I guess we should leave Rattie, Steen, Fabbri, and Parayko on the bench. Ott will do just fine.
As for player creation, an entirely new system would be perfect. Allowing for jersey templates to be downloaded and created would be great. If that would be paired with a way to create or edit the fonts used in game, players could easily throw together their own custom jerseys with programs like Photoshop, taking away the need for EA to worry about meeting everyone's demands.
International jerseys have been largely unchanged as far as I can tell from almost NHL07

But, let the players have some control to create and share. It's the year 2015 (nearly 2016). Plenty of people have photo editing software, and the time and ability to create brilliant things. Look at the mod support for NHL 04. Some of the faces in the game look better than what we have now. At least Ryan Reaves would likely agree. Give us the ability to create jerseys, better looking player models. Let us have an in-depth editor like in The Show, give us the ability to pick things like various skating strides and things like that. Attributes control the player separation in game, but the animations and likenesses are what really set it apart when you're watching.
A jersey editor would allow people to take a template, edit it and upload it, and then copy it into the game. A proper editing system would allow for international tournaments with teams like Slovenia finally getting representation, instead of Great Britain...a team I have yet to see on TV...
The more control EA gives us, the better we can make the game. If they want to focus on EA's HUT, that's fine. Follow the money. Just don't handicap the rest of us offline gamers in the process.
Edit: By comparison, here's a mod for NHL09

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