I'm gonna do some work here, to try and come up with a basic list of concepts. I love the strategy aspect of football, and while admittedly my knowledge is limited I think I could come up with a decent list.
Found what looks like a decent article on pre-snap movements:
http://xandolabs.com/2011/06/pre-sna...gain-leverage/
A quick glance and I already see something that Madden doesn't have: offensive shifts from one formation to another. Not all NFL teams do this, but some do.
Funny side note, when searching google for pre-snap stuff
a ton of Madden links pop up. LOL.