Suggestion: Medicine should be an expensive perk under Science. It's not very useful at the moment although, you can train it by useing bandages not that anyone actually does.
Eventually, closer to beta release, I'd like to see most of the information server side instead of client side. This would severely hamper many hackers.
Everything should be craftable, other than resources of course. One person can strip 3 towns in 2 game days, of cars just to get one set of 600's for 1 set of banks/generators which can be slightly frustrating. I'd also like to see a return of molds for gun parts. All of this would be lvl 10 science of course.
Zed pathing isn't something I see changing. It's probably just easier to add new zeds that have different rules. Probably wouldn't hurt to play around with a "Mad Mole" zombie that digs. Keystone/bottom of the world has always been the ultimate safe zone. Would be interesting to see a "Mad Mole" destroy structural stability and dig down to players.
I'd rather see boats than gyrocopters. It's more likely that Joe Schmo builds a boat than a gyrocopter. Personal oppinion.
With boats in mind. Need some fishing and some zombie piranha. Giant bodies of water are aesthetically pleasing but, rather pointless and annoying at the moment. Day 7? Just logged in? Go for a swim. Perfectly safe. Some scary fish would take care of that.
And for the love of all that is holy, can we do something else with snowberries? You need them lvl 1 in the snow but can't craft snowberry juice until much higher level when you don't need it anymore. Maybe an additive to crazy drinks like "Crush Soda" or something. Maybe even a quick heal like aloe only, worse, and poisonous. Or an additive for curatives. Anything else.