The idea of this browser if to have a browser without all of Mozillas features and make it just a lean fast browser. If you want a skinnable browser you should just use Mozilla and if you can code help in their efforts to improve performance.
One UI tweak I would like to have is the IE 3 squiggilies. I really don't like them. I like the look of IE 4/5 a /lot/ better... But, that's just my opinion. Anyone else? It's certainly not something major...