Is whisle-blowing an appropriate subject for corporation ethics codes?

yes. If you wanted to run a business, would you like for your employees to report waste, graft, corruption, or worse?

Now if you are doing those things, maybe it would not be such a hot idea.

So...I think yes. I don't think any business ought to be into corruption or graft or bribery. But many are, especially on government contracts. Where do you think political "donations" originate...Hint: not out of the good will of men's hearts.

A good question. Do some soul searching, and answer it.