A2 doesn't rust very easily. I live 11 or so miles from the Atlantic ocean, we have fog here that you can cut with a knife 8 months out of the year. The morning dew is so thick it looks like it rained the night before. Even worse, I store my Aurora in its leather sheath.
I've never had it rust.
All I do is make sure I don't put it away with water on it, meaning drops of water, and I wipe it down with a gun & reel silicone cloth you can get at any Wal-Mart, bait shop or gun store.
As for edge retention, I just load up one of the little stropping blocks KSF sells, and when the knife stops effortlessly gliding through what I'm cutting, I give it a few passes on the strop. Other than that, I've had it for a year and haven't had to sharpen it. Moral of the story: it's easier to keep a knife sharp than to resharpen a dull one.