Shortcut keys for the menus are not enable eg. alt-F for File, alt-E for Edit. I am running WebKit-r26759. Thanks.
Bugs in Safari should be reported at http://bugreporter.apple.com/. Closing as INVALID, as this relates to Safari and not WebKit.
<rdar://problem/5552221>
Fixed in r27012 - this turned out to be a WebKit bug, after all!