I have been asking Dan Fox (recently at HT, now at BP) over email about certain specifics. He’s been very helpful. I’m sure there are a ton of people who use Retrosheet you could email.
If you have the time and energy, you can download the play-by-play data files yourself, and figure it out in SQL. At retrosheet.org, click on “Event Files”—two things on that Event Files page that are especially helpful is ( http://www.retrosheet.org/stepex.txt ) and ( http://www.retrosheet.org/tools.htm ) which would get you pretty far into the process. Just get it into SQL, and google some basic SQL language for what you’re trying to do. If I knew how, I would help you out here.
It seems like you wouldn’t need Retrosheet to do that, though. Could you use Baseball-Reference.com?
Perhaps I don’t understand. Is this all teams in history, at the end of the year, or one (or more) team(s) as they go along the season? If it’s the former, Baseball-Ref might be able to help you out more than anything. If it’s the latter, then I can’t think of a better site than Retrosheet.