In addition to the current stats, I'd really like to see:
Rushing:
YAC - Yards after contact
AV - average yards per game
(BT - Broken Tackles)
Recieving:
YAC - Yards after catch
Defensive:
YCA - Yards per catch allowed.
I'd like to touch on the last one especially. Most of us have probably read the (setherick?) post on reading and understanding the thrown at vs catches allowed metric, where around 40-50% might feel kind of bad, it's actually quite decent, since it only factors in that one player in the defense and you -- typically -- only need to stop so many plays to force a punt. However, I feel like it would be interesting to also know, how many yards they gave up with the receptions.
I feel like I'd think more of a player who allows 70% of passes to be a reception for 2.5 yards average, than someone who allows only 25%, but for 15 yards average. Those numbers are, of course, completely arbitrary and pulled out of a hat, but I think they make the point for me. It's a (simple?) metric to see, whether a player is consistently good at limiting yards gained or if it's someone who generally cover well, but has lapses in concentration... so to speak.
The others are "just" stats I'm kind of interested in knowing. :)