Sadly, they removed some power user menu options, like "Open Frame in New Tab".
If it's something you absolutely have to have, there's always extensions.
I do on a regular basis, in order to get PDFs out of their frame on the Blackboard system of my university.
:)
I have the same problem, so I feel you.
Have you had a look at Chromium's source tree[1]? It's huge! I don't know how much complexity they'd save themselves removing a small feature like that (although you never know).
Have a look at the building instructions[2] as well. "Due mostly to its history and its complexity, Chromium uses a nonstandard set of custom tools to check out and build."
It's a good showcase on the complexity of a browser (and Chrome feels so light and speedy as well.)
[1] http://src.chromium.org/viewvc/chrome/trunk/src/ [2] http://code.google.com/p/chromium/wiki/LinuxBuildInstruction...