My personal Wishlist:
1-Upgrade Deathmobile! for the love of god it takes forever to use it maybe level 5 upgrade max with like a high level req. and only drops off an hour i would be alright with that.
2-Bigger inside base area. have them over flowing with worthless junk that takes forever or something once its clear we can build in there some not something grand like a whole map just double the inside building area.
3-Craft-able Fuel. Now don't "But the makers gotta earn money somehow" I know that is why it would be used with food like 5 days food=5 fuel or something.
4-more random events. Maybe come across a hostile survivours in one of the outtings and get shot at while zombies come to pay you a visit, like he is in a wacth tower or something.
5- A bunker for 1-2 people with guns, I would go with 1 to make it fair, they are untouchable until the bunker gose down. And possiablely have the limit be 1 or 2 bunkers at like level 15-20.