Just for fun, here's what Tomko did in relief for the Dodgers in 2006:
IP: 30.2
ERA: 3.64
K/BB: 29/9
BAA: .246
WHIP: 1.21
K/9: 8.53
BB/9: 2.65
HR/9: 0.88
http://sports.espn.go.com/mlb/player...hing&year=2006
Granted, it's a small sample size and he didn't look good in the playoffs, but if he could maintain that level of production for a whole season, then I don't think it's a stretch to say that he'd be a very effective closer.
And, given the other options available and their likely salaries, I think Tomko might be worth a shot. Especially if we have Dan Wheeler around in case he falters.