1.more hot routes (like post, slant, post-flag) perhaps, you could hold a shoulder button and in for post, out for flag.?
2.Human controlled blocking? sounds stupid, but think, you could control an ol and tap x to drive or something.
3.homecoming weekend
4.have the actual dog instead of that 7 foot tall Smokey.
5.have the fans singing Rockytop
6.gang tackling.
7.more realistic croud. pass in the air(quiet) interception(explode)
8.CREATE A PLAY IS A MUST
9.Quarterback Bootleg
10.personal fouls

All good to me. I like the idea about the offensive lineman.