For better or for worse, roll-offs have become, for the most part, the default mechanism for settling end-play rank. In the cases of O or 100 tables, it's an expedient way of settling things, and works well enough. On higher tables, however, it can often be a lame way of ending the game. That is, after spending 15 minutes playing a game, weighing odds, planning moves, building a base, etc, no one wants to lose it all with a roll of 18.
So, to at least reduce variance in deciding the outcome, I have tried out a two other ways of rolling for rank, each of which have been fairly well received by the players who participated. They both involve rolling 3 times (and therefore most practical for 1/2 rolls). In the first case, the players take turns rolling. All three rolls count, and the winner of two rolls out of the three (if the third is necessary) is the winner. In the second case, each player rolls three times, but only the highest roll counts towards the outcome.