I have Beocenter 6-26 so it may be work differently. AV3 is set to an input selectable with an hard key (V.MEM maybe, can’t say because I use a blind Beo6 now, sorry…). Then the HDTV option below is set to DVI. I remember that even when I was using a Beo4 It didn’t never required to use the LIST key. I even remember it was an AV Beo4 because I used that key to start the BV as a speaker with the picture muted. Hope this helps.
Yes this is the case with some of the newer BV/BC6-26s and 6-23s. Unfortunately the older 6-22’s connections menu does not allow you to assign DVI to one of the inputs, hence ovide will need to find a remote with the PC option.