I don't know if the following suggestions are possible or not, but here it goes.
- I would love the ability to choose what year you're drafted in, so people my age could go back and play in past years. Eg: I graduated H.S. in 1992 so I'd choose for my career to start in the beginning of 1993 and therefore play with/against players from 1993 on. If it's too much data, than maybe just from the modern era.
- A Stats search option (not necessarily advance but could be). Examples: Look up other player stats. The ability to filter search your players stats like How many Grand Slams, hitting streaks, RISP, walkoff HRs, walkoff Hits, etc, etc. I have a friends nephew whose currently playing AA for the Red Sox. I would've gotten a kick outta looking him up to see how his progress is in the game, lol,
- The ability to virtualy view the stadiums.