We haven't found a way to put this in yet without jeopardizing our relationship with the NFL.
Our idea for next year is to be able to still dive and hit stick players within like a really tiny range as they go out of bounds...kind of like you did it on accident...and it would be a chance at a penalty - i.e. not called every time.
This isn't really all that great yet. I didn't work on any of the sideline stuff, but do I know that the tech needed to add a lot more players while still getting PS3 to 60fps meant that they weren't going to have time to have them interact with onfield players. You shouldn't see them walk through walls anymore though.