Gun skins - I've always wanted to customise guns the way I wanted.

Different weapons in bases. Turret machine guns, laser trip wires, claymores. Era is in this time zone, use it to your advantage. Weapons like this could be purchased inside the base and used for defense, only. Would this make bases too difficult to attack?

Car customisation - let us pimp our rides, an ability to tune them to make them faster, change the colour to any on the spectrum! Neon under glows - PC has them, why can't we?

An ability to hide buttons. Movement controls get in the way. I've memorised which button does which, if we had an option to hide them, that would be great.

Smoke grenades and flash bangs. They could white out an area of where they were used, flash bangs could maybe slow movement or something.

More house packs. More interesting ones, they old interiors get a little boring, they're well made, however.

More jobs. I can't really think of any ideas. More jobs, more ways of making money.

Farming in houses? This has been brought up before, and I think it's a good idea.

More hand guns. I don't see many of those around the streets. We have AP7s, MK23s, Uzis, Desert eagles, Colt 6, Taurus, Glock and the starter hand guns. That's not a lot, and the gun range doesn't seem balanced. Let's mix it up.

I realise some of my points may seem invalid to you, but everyone has different opinions, so, don't like? Talk about it, maybe they could change and suit everyone.
I would play way more if this stuff was added. I'm sure others would, too.