Suggestion
Have an option to tie market size to city population.
Reason
The New Yorks and LAs and Chicagos of a league should always have larger markets, etc. than the Kansas City's. But now it's determined randomly. It shouldn't be too hard to tie these to census numbers, which would not be totally accurate but at least have a logic. This site is good for historical data:
Population of the 100 Largest Cities and Other Urban Places In The United States: 1790 to 1990
Priority
High. People have been asking for this for years.