I think HoS should have a real minefield system, as in minefields actually placed in the world, not just an area where you have a X% chance of exploding.
Also, I think minefields should be used in tactical deployment, not just to stop people leaving the map.
It could also expand the role for combat engineers if they had a choice between say satchel charge or mine detector.
I enemy engineers could plant anti- tank mines on roads and such, engineers could use mine detectors to find them and get rid of them, or detonate them with grenades.