I use both the WikiMarkup editor and the VisualEditor all the time, I was edit a project page for a while, and when I went to a article to make a small grammar fix, I noticed something, whenever you are finished editing, after you type in the edit summary, the enter key doesn't save the edit. What I'm saying is that I wish the enter key would work for at least the major Wikipedias in the VisualEditor some time soon. I don't know how hard this will take, but I hope it isn't too long to integrate.
