Hello all you Legends,   Considering I have many ideas, I thought it would be best to make a single post containing them all so the Devs can look at one instead of lots of mine!   So let's begin!   1.  Supporting SLI/ Crossfire.
This would improve the games performance for many users, also allow the game engine to be pushed more.  2.  Largest map size possible.
I think bigger the map better, I do not care about hard drive space, 100GB game? This game is worth it! The map being so large would enable more to be put in, because what happens if it's small and all the houses are bought? We have to find a server with a house not bought! 3.  Allow car tuning or customising for racing.
Pretty simple, street racers want to customise their cars, tune them and make them best they can, so why not allow a full tune system like Forza Motorsport or something so the car handles the way we want, dragsters can make drag cars, drifters can be drifters and it makes for a more diverse system, maybe even people arranging car meets with customised cars and tuned.  4. Allow us to survive off the land by hunting, camping.
Simple as the name, if the map has a proper forest like we seen, full detail camo and hunt proper either for a sport/ competition or for fun with friends sitting at a fire talking.  5.  Make the police do a survey or some work before, reasons below.
I think making the police a little harder to get into is better because, no one wants someone who has joined the police, given a car and acting like a t**t, so making it a little time consuming or something before, might eliminate people wanting to waste time for it!
Nobody wants a troll police from which, all the players who has played Altis Life has met, a lot! 6.  Share homes with friends?
Allow us to share a home with a friend, like add them as a room mate or something and designate a room for them so they can customise the room only and pat towards rent etc 7.  Allow the drug dealers to grow drugs at homes or apartments? Also buying land to grow and produce on!
For the people who want to do the illegal operations. Why not if you buy an apartment or house, make a small section able to grow or produce narcotics.  If not why not buy some land maybe in a forest or somewhere secluded, produce drugs and stuff and then give to the dealers to sell and make money... Instead of going to one spot on the map all the time, making it easy for the police, more realistic this way I think and fun! 8. Adding pets.
(My wife suggested this) she likes the idea of buying a pet in the game, doing work or robbing shops or banks or whatever your long day is, coming home and having a pet and maybe interacting with the pet would increase a comfort level or increase happiness or something. Maybe even walk the pets (if walkable like a dog) and maybe meet other players that way too. 
(This sounds like something different to me lol but that's what she wanted me to add) - she will buy the game if she has this option lol she wants a dragon.... I am unsure how real this game should be but a mini dragon would be cool.  9.  Mini games I can think off which would be amazing in a matchmaking or private it friends (some of these are in the game but I'll list anyway)
Paint balling/ DESTRUCTION DERBY/ pool/ snooker/ golf/ bowling/ darts/ go karting/ mountain biking/ sky diving (ran out of ideas but you get the idea 
(There could even be games added to the In game laptop: computer that you could play, kinda like the Java games lol) 10. Buried treasure? Easter eggs? 
I love open world games, I love exploring and finding things. For this game in the masses, it would be awesome to have lots of Easter eggs in the game or even... Buried treasure! Like find a map and solve the puzzle or riddle to find some random generated treasure, maybe even have underwater caves to swim into and explore to find pirates stuff 11. Big explorable ocean? 
Just water, boats, ships etc which would add more vehicles and even add stuff under the water to find, ship wrecks, treasure, caves, sunk items etc... Scuba diving fun! 12. A casino!
A casino for poker/ black jack/ roulette and so much more with slots to maybe win in game stuff like currency, items, cars, clothing, limited stuff and all multiplayer to play the money against other players! 13. Tablets companion app to always keep connected and earning money!
What about an iOS and android companion app to always keep ton connected to the game, earning money and still playing when you cannot! Stuck on public transport and want to check if a shipment has arrived or something, want to send orders for stuff ingame, this would be it! 14. Third person options. Allow us the option to cycle between different camera options. I do not think many people can drive from behind the wheel view, the same as not many people prefer first person and prefer third.  15. Allowing us to customise heist vehicles for a good bank robbery, putting armour on and making a good run. Basically we want to rob a bank, truck, supply runs or do anything daring.  Allow us too create a vehicle or two with a gang or something to make a daring heist armoured up! (This is different to vehicle customising for racing and tuning) 16. Motorbikes passangers face back and front. When on a motorbike and you have a few friends and bikes, being chased etc by police or something.  Allow a friend to choose between getting on facing front or backwards, so if facing back the driver can drive obviously, and the back passanger can watch behind for making some intense police shootouts and chases. 17. Make lots of small alleys and side streets to escape through and underground tunnels. This is simple, a city would be a big size and allow small alleys for a bike to fit down, underground tunnels to escape through or get around without being seen above, but make them limited. 18. Get married and earn bonuses Yes, this might seem like a silly reply and maybe going more realism but I was asked for this by my wife who also bought the game, so I said I would put this here! She thought, the option to get married in game (Even though we are married in real life) and then when doing jobs together as a group, we earn a bonus of XP/ Cash because we are a group. 19. Large groups on screen. Most games allow only 4 people in a group, some do not allow groups at all and you kinda just work as one.  It would be great, kinda like the Elder Scrolls Online group system, where you can group up (names on screen in a list or something) making it easier to show up on the map, with an interactive menu to change certain things (Sadly kinda like the GTA Interactive menu) so you can change things about your character and whatever, but allow the group leader a special option to change things for all. 20. Prison breaks? Breaking friends out of jail.  I do not think that jail time in game is going to be super long time, but if it's a few hours or minutes, can we break them out of jail in some mad system we create.  Plan and put into action or something.   I like both and can do both so not fused.
That's all I can think of right now! Sorry for the long message but I hope atleast one person likes what I've written. Enjoy all!