I dunno, I think it'd be awesome. A bar in south america, a puff of cigar smoke. Spooks enter, Arnie turns around and one of the spooks says "Shaeffer. We need to talk." "So talk." "Val Verde 87. LA 92. Now its here."
Then a Ripley-like scene where he briefs the spec ops team. In fact, I can just imagine that Arnie accent: "I hope you're right. I really do. Because just one of things managed to wipe out my entire crew team in less than 24 hours."
Not that I've read any of the script leaks or whatever - but Mr Black... "Would you, Sir? I'd like that." (something like that anyway).
I'm not saying he should be the obi-wan of the team, be in the whole thing and die on page 75, but a little scene would be brilliant.