@phenomenal: I thought it was well accepted convention that travel speeds don't translate to battle speeds? That's always the logic I see for why Superman can't just destroy everything.
Besides, unless it's noted outside his bio, it's possible that lightspeed travel involves subconscious automatic processes, isn't it? Something like his tactile telekinesis kicking into overdrive and "feeling" obstacles in time to automatically draw him out of light speed in time to avoid collision.
I'm really just playing Devil's advocate here though. I get the feeling you've got the result and the reason nailed down, I was just wondering how things would look if that edge was removed.