- Career leaderboards
- Season summaries (ie, record of previous standings, award winners, stat leaders)
- Editable stadium names
- Fix the bug where doing a double switch results in the pitcher getting credited with playing a fielding position, the position player gets credited with appearing as a pitcher (look at some of your old box scores for examples of this annoying bug)
Would be great to be able to edit or create players, but I think the most critical enhancement has to do with being able to browse the historical league and player data. If the game itself can't handle the task, then an export feature would suffice.