Two Point Conversion stats
Two Point Conversions in the NFL are only scored as either "Successful" or "Failed". There aren't any actual stats accumulated during a 2-point conversion play, and there isn't any opportunity for the defense to score points by an interception or fumble recovery. As a specific example in Week #1 of the 2012 season, in the Broncos/Steelers game on Sunday night, the Broncos scored a successful 2-point conversion when Peyton Manning threw it to Willis McGahee. But if you look at the stats for the game, McGahee does not have any receptions. So for example, even if you were watching the game, and you know you saw McGahee catch a pass after the TD as part of the conversion, it won't count as a reception in a PPR league. Just a heads up on this. And if you watch the defense intercept the ball on a conversion attempt, it won't count as an interception for your Team Defense.
MyFantasyLeague.com has several options available for scoring 2-point conversions. You can assign points to individual players as needed with the "Passing 2 Pointers" rule, the "Rushing 2 Pointers" rule, and the "Receiving 2 Pointers" rule. And you can assign points to the Team Defense or any other "Team" position with the "Successful 2 Point Conversions" rule, or penalize a team position with the "Failed 2 Point Conversions" rule.
As always, you can click here for the full list of available scoring rules.