Hmm, I like most of Skyrim as is, but I agree with most in saying that the game needs more diversity in missions, more guilds/factions along with longer questlines in them. Also, the ability to utilize all 10 of my fingers, and also wearing multiple necklaces, I understand why I can't, but come on, what's the point of having all these really good enchantments if I can't use them all. Hmm, maybe a shout that gives the Dragonborn a brief amount of flight time, because there are just to many mountains, and my horse can't climb everything try as I might. Marriage be more interesting, like have the spouses act like spouses, have kids (That aren't adopted) and be able to use the creation system to make them look like both parents, similar to how Sims 2 does it. Speaking of the creation system, allow me to change my character's looks in game.
Some of these are major changes, and others are little, but they would all make the experience soooo much better