One thing I would like to see is an option to tweak the amount of sites listed in the History menu; perhaps be able to list more than ten before going into the "Earlier Today" submenu, or be able to disable it altogether.
Another missing feature is auto-site name completion (I don't know if that's the technical name for it). For instance, if I type 'homestarrunner' into the location bar, intuitively (or at least how it works with Chimera and OmniWeb) it would change it to 'http://www.homestarrunner.com' and go from there. I wonder why they didn't put that in?
Another thing I've noticed is that rather than having individual buttons in the toolbar that you can rearrange (a la Finder windows), you just choose options from the View menu of which buttons you want to see on the top (like back, forward, etc.). Why the difference? Is it so it won't screw with the oh-so-nice brushed metal interface? I'm not complaining, just curious.