Well, I don't think either of these issues breaks the rules. Even if you argued that they were "pushing it", neither really seems to be excessive. If he was running a CONSTANT hurry up, that would be one thing. But going to it twice in the entire game doesn't seem unreasonable. The rule isn't black and white of "Don't use it unless it's within the 2 minute warning". But like anything, it shouldn't be abused either.
As for a 4th and 2 on his side of the field...not sure how many times it can be stated, but if you only stand to gain 20-25 yards with a punt (ie. it goes into the endzone), many coaches would consider going for it to be a calculated risk. Two examples from just the game I watched today (Titans - Texans), on 4th and 1, at the Tennessee 11 yard line, with 1:04 left in the 1st quarter, and winning 7-3, the Texans went for it, with Arian Foster picking up the 1st down. They threw for a TD on the very next play. To ME...that's a pretty damn aggressive playcall, and I don't know why you wouldn't just take the 3 points, but I guess Kubiak was confident in his running game. Not sure if that's an attitude we want to strive for in here, but it does happen.
Then, with 2:36 left in the 2nd quarter, trailing 14-3, and facing a 4th and 6 at the Texans 36 yard line, the Titans were going to go for it rather than attempting a 53 yard field goal. But a delay of game penalty caused them to end up punting anyway. That's the biggest thing people need to remember. It's ALWAYS situational. If you can't explain why you went for it in any given situation, you shouldn't be doing it. But if there's some logic behind it and you can defend it, then by all means, make the call.