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This video's pretty funny for the one moment when he tries to talk to Marcel (whom he calls 'Magnus') and Marcel says 'now it gets faster' and off he goes:
https://www.youtube.com/watch?v=vFx5k4FadxA
Fast forward to 1:10.
I expect you probably stop less, but as with any seated position you undoubtedly have to from time to time just to avoid getting stiff.
Recumbents in general are great fun.
It's an interesting question, still, whether Nathan ought to honour the rules that were in place at the start of the race--obviously, Marcel may not want that, and, as you say, agree that he should be in a different category. I'm assuming that the rules, which I haven't read, actually did say that it's completely open in that respect. Perhaps Nathan just didn't realise how much faster velomobiles can be, with the right rider. You could have riders that are much faster than Marcel, too. I reckon that skinny bloke would go like the clappers in one. :)