I think an interesting way to add a new dimension to the game would be the ability to choose your previous occupation before the apocalypse. This could affect your starting equipment and perhaps a perk, i.e a fire-fighter may start with a fire-axe and have increased melee damage or speed Or perhaps an engineer or mechanic would be quicker and more efficient at jobs involving machines like refuelling cars and start with equpment involved in such tasks. Also it would show the sort of people that would be able to survive in that situation.