Why not add that to the game?
It has a lot of advantages especially for the airlines which are based in Sao Paulo Congonhas or Santos Dumont in Rio de Janeiro and other airports with short runways to give better performance and increased payload.
For those who don't know a lot about SFP here is some information about it:
It is an optional package for 737NG which allows operators fly with increased payload in and out of airports with runways less than 5000ft long.
1. Two-position tail skid that enables reduced approach speeds
2. Sealed leading-edge slats that provide increased lift during takeoff
3. increased flight spoiler deflection on the ground that improves takeoff and landing performance
For more info click on the link belowhttp://boeing.mediaroom.com/2006-07-31-Boeing-Delivers-First-737-with-Enhanced-Short-Runway-Package-to-GOL
And to prove that they can actually do follow the link belowhttp://www.youtube.com/watch?v=yrDniZ23s0Y
(All copyrights goes to the respective owner not me)
Highly doubt that anybody has mentioned this before but correct me if it was.