Have patience. A firmware update is slated for sometime in April for the 5DII which, while not openly stated, will most likely add manual controls for video.
OT but where does this info come from? I have just published a formal quote from Canon Australia saying that this is
not happening.
“Once in movie mode, the camera will control
everything, including shutter speeds, aperture and
ISO. Only exposure compensation is possible. When
shooting video, aperture control is not possible in order
to prevent the recording of aperture-related sounds.
Because of this, exposure control uses a wide range
of ISO and shutter speeds. The shutter speeds are also
controlled in such way as to provide natural-looking,
flicker-free movies. There is no firmware upgrade for
this as we do not believe it is an issue”.
Straight from the horses mouth as it were...