Nice work. Eventually I would like to compare each QB to the average of the top 10 QBs(or maybe top 5 QBs) of each season. I just haven't had the time to compile the data.
You could count the number of top 5 or top 10 seasons.
Top 10 Seasons in Passer Rating
Staubach 7 (1971, 73, 75-79)
Aikman 6 (1991-1995, 1998)
Romo 6 (2006-09, 2011-12)
Meredith 6 (1962-63, 65, 66-68)
White 5 (1980-83, 85)
Top 5 Seasons in Passer Rating
Staubach 5 (1971, 73, 77-79)
Aikman 4 (1992-95)
Romo 3 (2006-07, 2011)
Meredith 3 (1962, 66, 68)
White 2 (1981-82)
Average Rank in 5 Best Seasons
Staubach 1st
Aikman 4th
Meredith 4th
Romo 6th
White 7th
That's an excellent tool for comparison, with the caveat that Meredith's rankings are skewed by league size.