More to do in the beautiful Wasteland - random encounters, mutant attacks, hidden caves, wildlife spotting (!), rare items to find and collect, more reason to explore the place and more Wasteland-based shooting. At present, it feels like a tech demo for the terrain with very little to actually do there.
Once the game has been completed, I'd like a way to quick-load each of the hideouts / dungeons so I can just go for a shoot - the gun play is the strongest aspect of the game and I found the other stuff - although done well - diluted and fragmented the traditional maps and gunplay encounters. Sometimes I just want to go shooting on a map of my choice. Like loading up classic Doom or Quake levels.
Please don't leave hideouts empty once a campaign mission has been done there. They shouldn't need a specialist mission to be found and activated to re-populate the hideouts. I'd like to be able to revisit my favourite hideout and just go killing (or replay my favourites, see above). I suppose I could just create saves for every one... hmm

A way to play Rage Frenzy against friends.
Reduce the grip of vehicles on sand and gravel. Handbrake should make the vehicle power slide, not stop - U-turn on a dime!
The invisible walls - are they really needed so much. If I want to go explore, why can't I? The game teases open world but then restricts you from straying.
Increase how far the player can fall before he dies. It's probably realistic as it is but it's very annoying to fall 4 metres and die (especially when you have to go back so far).
A map of the available world and a means to place a marker for directions to a location of the player's choice.
More of everything - preferably in the order of: Hideouts, clans / enemies, missions (main quest missions, job boards, NPCs that currently do nothing could give extra missions), ammo types, weapons, engineering items, vehicle upgrades, vehicles, races. I'd like to see the world that is there fleshed out.
I haven't finished the game yet but from what I hear the ending is abrupt and awful. Can that be changed, or even better for the story to carry on from there.