That rule works as follows:
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There is no limit to the number of GFI's a player may attempt, but each successive extra square becomes harder to achieve. The first extra square is at 2+, the second at 3+ and so on.
The benefits of such a rule are basically three parts.
1) By allowing people to risk the extra squares, you open the game of a little bit. With this rule there's no more cheesy counting squares to make sure no one can get to you.
2) It eliminates the "useless turns" that sometimes come up at the end of the half. You know the ones, where you can't make a TD, so you just beat each other up. Now you can try for the TD.
3) It makes it slightly harder to make a one turn score. Since the roll gets harder every extra square, there is a slight decrease in the number of One Turn Scores by those teams that could make them before.