Hello Dannic.

First, the 950 does not internally support switching between surround back speakers and surrounds. You would need to do something externally.

As for 6.1 movies (Dolby EX, DTS ES), it is very straightforward. It is a simple matter of turning the processing (Dolby EX, DTS ES, Dolby+Cirrus Extra Surround, or DTS+Cirrus Extra Surround) on or off from the remote. If you haven't done so already, a quick look through the 950's manual may help you with your buying decision.

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