I find that one thing that DoF is missing is a formation for groups of Units. If I group 4 archer units together, I want them to form into a line. As is, if I want this, I have to do it unit by unit and they never seem to end up orientated the way I want. If there was a small group of various formations (Line, Column...etc) this would make group be much more effective.
Following this, there should be formations for mixed groups (melee front, archer behind and cavalry on the flanks) so that I can setup my army with the click of a button, and not spend the first 5 minutes of a battle geeting my troops into something that resembles order.
These are things that I really like about the Total War series of games. The group and army formations are top notch.
My 2 cents.