I don't have a 4:3 release at hand to compare, but from watching the ADV versions, it looks like the show was shot in 16:9 and cropped to 4:3 for airing.
I believe that earlier series never had more than one in-vision commentary per disc (the others were normal audio commentaries), while two episodes on Disc 2 of Series 5 ("Victory" and Angels #1) have in-vision commentaries.
On Blu-ray, that would have been possible. Not on DVD - the in-vision commentaries take up as much disc space as an entire episode on their own. The only way to avoid splitting the Angels two-parter would be to have "Victory of the Daleks" on one disc and its commentary on another.
I don't have any region-free pre-recorded PAL DVDs to try with, just R2, so I can't try those. But NTSC ones I've created work just fine, and it throws up a "wrong video format" error message, which makes me pretty sure that it's not a problem creating the disc...
It can handle PAL content on a Blu-ray disc - the special features from the UK Life on Mars discs work fine. But it throws up its hands at a regionless PAL DVD I created on my computer.
The sets are already expensive enough - I'd hate to see how much they'd try to charge for the 10 disc set with complete Confidentials & their music rights!
I suppose it's too much to hope that the US release will finally get a real Blu-ray case like the UK got for The Complete Specials and Torchwood: Children of Earth (and maybe earlier Torchwood) instead of digipacks...
It's only the second block of episodes produced, but it's still the third series to air. I believe - though I could be mistaken at several weeks remove - that even the producers were referring to them as two separate series in the commentaries.
(Do you refer to David Tennant's outgoing...