For instance, I would like a taunt button. I want to be able to walk up to people and slap them.
This. Really missed this feature on Oblivion, which is missing. I thought it served as another incentive for playing a personality-centric kind of characters just in case they really need to get in a fight but don't want to get arrested by the officials as a consequence ("They attacked me first, sir. And I just happen to killed every single one of them in self defense. M'kay?". The one particular quest in the Council Club of Balmora with the Camonna Tong comes to mind. Plus, inciting a pub riot in Skyrim seems pretty fitting, drunken Nords and all.
Also, another small yet potentially very useful feature I had in mind is A JOURNAL. No, not the quest journal; the one where you can type anything you want in game to help you organized and stuff. Might be even cooler for those folks who like to write fanfic stuff (not one myself though, gotta say) if you can save the file in your computer or whatever the equivalent is one the console versions, and let you upload it for other to read. But mostly to keep you organized. And saves paper.