One thing, player sizes? Not all players are one size, not too bothered about fat and thin, although that would be good! But mainly tall and small players, potentially having an effect on the lengths tall bowlers need to bowl compared to average height. But also different lengths to shorter/tall batsmen, and different areas for front foot/back foot shot selection.
I do not know a lot about coding but wouldn't see it be too difficult to do, would add another dimension to game, and make people think about another factor, making it harder, but with concentration can still be done, which AI batting wants to be.
Another point, fielding! Not the catching system or anything like that, just the animations, its like watching fielders from the 1980s! Add in loads of new animations, make it exciting whether or not that ball will go for four, with despairing dives. Would also like to see better keeper animations, them moving their feet, and no horrendous diving one handed flappy catches to spinners.
Apologies if any of the fielding stuff has been implemented in international cricket 2010.