Joe1958

I assume you are familiar with OOTP (Out of the Park Baseball), which certainly has its good points.  I'm also looking for a good baseball simulation, one that allows either import of customized stats or easy editing/creation of players.  The earlier versions of OOTP allowed users to import players through .csv files that you can create using Microsoft Excel, but that doesn't seem to work on the more recent versions.
 
For me, the ideal sim would emphasize player performance and GM flexibility and things like attendance, finances, and scouting would, if available, be optional add-ons.  In other words, it would be a lot like a computerized version of the card-based games (Strat-O-Matic, APBA, SI All-Star Baseball, etc.) that predated the personal computer era.  OOTP includes all the "extraneous" factors, which can add fun at a certain level, but provide unnecessary bells and whistles for many people.