We haven't played a lot yet, but my group isn't pushing much, only when they really *need* to hit. I think out of the three sessions we've played so far (like I said we haven't played much yet) they've pushed maybe a total of three times
rolling more ammo dice always also increases your chance of a jam. RAW, a gun can never jam on the first roll, no matter how many 1's you roll. It only jams when you push, and if you've rolled a lot of 1's already (and therefore have to keep them) you just don't push. That's the one rule change fro...
As Fenhorn points out, this makes Combat Awareness virtually useless. Drawing two cards out of 10 (or 9, or 8, or 7, depending on where at the table you're sitting) is leagues better than drawing two cards out of 52 (or 51, or 50, or 49)
Career officers (at least around here) have a reputation for gettin' dumber as they get older, so I think I agree with with Baldrick on this one, although RAW because you "choose" your career each term rather than "continue" in it, I suspect the official answer is "no more officerin' for you"