@Chirs & Thucy:
Yeah, that's the scene that I was thinking of.
I think that it's pretty clear from the comic that this power is SUPPOSED to be simply a result of Ozy's highly focused will and the extraordinary training that he put himself through. And that Ozy himself (at least) believes that it is a power within the ability of every ordinary human being to achieve.
To quote Ozymandias from the appendix (which therefore probably didn't make it into the movie) to Chapter XI:
‘The disciplines of physical exercise, meditation and study aren't terribly esoteric. The means to attain a capability far beyond that of the so-called ordinary person are within the reach of everyone, if their desire and their will are strong enough. I have studied science, art, religion and a hundred different philosophies. Anyone could do as much. By applying what you learn and ordering your thoughts in an intelligent manner it is possible to accomplish almost anything. Possibly for the “ordinary person.” There's a notion I'd like to see buried: the ordinary person. Ridiculous. There is no ordinary person.’
I suppose that it's debatable, but I take this at face value. In the Watchmen universe, while there is one person who obtained god-like powers through a freak accident, it's also possible for ANYBODY to obtain übermensch-like powers. As Ozy is the only person to have done this, he is super in a way. But as these powers are available to everybody, in a way he is not super at all.
Or you could argue like this: Ozymandias's superpower is super-strength of will, and everything else comes from that.