A script does exist in the NBA Finals but it is not as powerful as the scripts in the earlier playoff rounds because the scripts exist in the playoffs so the NBA gets its desired matchup in the Finals, after that all they care about is the Finals going at least 6 games
Although I will say the NBA does have a preferred winner of the Finals but they generally wont bend over backwards to get that winner most of the time although it has happened before(See: 2006 NBA Finals Heat vs. Mavericks)
The jury is still out on whether or not the NBA will try to strongly influence the finals this year, I say probably not because the NBA got a desired matchup and could care less who wins this year
2011 and 2012 was an experiment. They experimented with a Heat loss in 2011 and Heat win in 2012. Both were rigged. They realized that the ratings and fan response was better when the Heat won in 2012 which is why they rigged a Heat win in 2013.
If I say there will be a rig this year it will be for the Heat so LeBron can get his 3rd ring to continue to fuel the LeBron vs. Jordan fire which drives up ratings but the NBA will be fine with a Spurs win too as that will probably disband the Spurs and the NBA can stop having to deal with them and their small market and limited national reach, if the Spurs lose they might give it one more go
The NBA would love nothing more than for the Spurs to finally go away so that more marketable teams/markets can rise in the West