Ive never tried Av mode. Is there an advantage? Or samething as in M mode?

I also was able to get 1/60 and various ISO settings but wasnt able to lock it down.

How To Use Video Mode on the Canon 5D MK II on Vimeo (http://www.vimeo.com/2517472)

But when using EF compatible lens there is no chance to get the shutter up from 1/20th when using 19mm wide lenses for example and it will not come down from 1/80th or 1/100 when using 85mm lens - this is pure logic of photography shutter speeds vs lens focal length but why on earth did they implement it to a movie mode?
Are you really sure that you are not dealing with the photo mode during the video recording?