Come to think of it, when I tried once, I was surprised when my car wouldn't start in neutral without my foot on the clutch. It's just as well, though, as it's just extra mass for the starter to get up to speed. I have put the clutch in half way and then dumped it as I'm starting, though—no biggy.
Either way, I always start the car in 1st or R with the clutch in. I make sure it's in gear before starting (just habitually).