I like the idea of corpses staying on the strategic map after a battle. It marks the location of a major event, and would make the territory more interesting. I suppose it would be the EWOM version of a historical marker, only written in blood.
What is great about this idea is that the longer the game goes on, the more battlefield debris would litter the landscape. Having the land heal is a big deal, so leaving spots on the countryside that have been marked by violence would give it a more real feel. They could disappear after a few years I suppose.
Good question.