Hiding plays from Dallas?

[Rock31]

Merry Christmas to all, and to all, a good night.

Secondly, this is certainly not reflective of any insider knowledge, but I've been thinking about the upcoming matchup with Big D, and have been wondering the following:

Does our offense hold back on some of the more complex formations and plays in this regular season game? We need to win, without question. But, when considering Dallas would be our 2nd-round playoff opponent, do we completely eliminate the Portis-as-QB or Randle El WR reverse specialty plays? I feel there will be a little chess being waged between our coaching staff and theirs regarding the play-calling. We may benefit from not using the full complement of Saunders' playbook in this game, so that we will be able to possibly take Dallas by surprise in the playoff game.

Is this stupid?