Well, I liked the movie a lot, so I wouldn't change too many things in the movie (the more you change a movie, the worse it may become). Here's what I would change:
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More Kodi (Yes, I would have loved to see more scenes with Kodi, mainly from the part in between him going to help Balto and having the other sled dogs following him. That would have been much appreciated!)
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A bit less of Stella (Mainly her song, of course. If it was a bit shorter or even less "sexual" as it was, then I think that would be all I would change for Stella. I thought she was a great character, but change or even ditch the song at least!)
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Different love (Um . . . I think you guys would agree that we would all want to see some Dusty/Kodi love instead of Boris/Stella anyday! I saw a hint of a possible Dusty/Ralph in one scene (did anyone else catch that?), but I think she's better for Kodi anyday!)
Umm . . . . that's all from me!

I did see the Dusty and Ralph scene.. I think Dusty deserves Kodi, not Ralph.