I would like to see the customization of of site look and feel and menu customizations made simpler. There is a lot of great info on the forums but doing this is sort of hit or miss and was not easy. Yop had to weigh the time of the post verse where we are now...some of the help was out of date. I actually did it and then removed it since I felt it may break in the future. You can keep the CSS option for people that want to spend time doing that to get really cool looking sites but it would be great if there were a simple way for those of us that do not.
So the ability to rename menu options via a UI
The ability to select menu option image via a ui
The ability to set up page templates so you do not have to format everything on every page.
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