God, yes. Would like to see much more of it.
The obvious issue is that it's very, very, very difficult to do when you're dealing with large casts of Space Marine characters. Not impossible, but definitely difficult.
I find it fairly easy with humans, and a little easier with Chaos Marines; I think my Chaos stuff stands up pretty well with the majority of it away from the battlefield. But I'd still love to see way more "domestic 40K".
An Arbitrator series? Well, no one's going to write anything as good as Matt Farrer's Shia Calpurnia stuff, but that would be an incredible challenge.