On your "second" question: On the BV7 MKII (which you seem to have) the whole digital audio implementation is screwed up. It doesn't support plain 2-channel stereo (PCM streams) of the digital inputs (SPDIFs) but gladly accepts 5-channel "stereo" (aka DD 5.1)... ..for some unexplainable reason. This is (and will be) a major issue with more and more HD-cable boxes only supporting digital audio (or at least is only switchable between digital and analog audio, as mine are). I have 3 sets of BV7-40 (MKII) which currently don't do much of a performance as I have no sound way of watching plain tv (news, sports etc., as they broadcast in digital stereo, normally) _or_ watch movies from the premium channels (HD) where they often broadcast DD5.1.. (without doing that manual reconfiguring of both the tv and the stb:s, when I switch channels.. Surfing through 40 channels on a saturday night isn't much fun now...).
You will have to keep reconfiguring your setup like you discribe everytime you wish to switch between digtial surround and plain digital stereo sound (which wont be digital in you $15.000 tv-set..) Way to go B&O!