Not that I am a big fan of them iron trucks, but there are a few things I'd love to see outside of systems modelling.
1.) area targets
2.) visibility
3.) AI that can actually detect the target zone without me having to guide it to it and serve it on a silver platter
4.) no more "target these specific trucks on this road" but "bomb enemy supply lines at XYZ"
EDIT: Damn, I missed that. Actually loadouts were ordered for combat missions. I'd rather not have a "toolbox" to fiddle with. This results in too much unhistorical BS IMO.