Just a couple of quick notes (some of which I've listed a million times before, but with a topic like this need to list again):
1.) The game is WAY too late in its development cycle to "add" anything like this. It would be in or not in by now. The game was more or less finished in May, it was just delayed to add polish according to Rockstar North.
2.) I can't understate this enough; A police sim has NO major mass market appeal. People play Grand Theft Auto to break the law. They want to do things that they could only dream of getting away with in real life. It's an escape from reality. The freedom you get is the major hook for the game. It's why people play the game for months after they beat the story randomly shooting cops, stealing cars, beating up hookers and causing pile-ups on the highway.
If you don't want to believe me, consider the sales figures if you want. In 2012, there were more than 25,000,000 copies of Grand Theft Auto 4 sold. The LCPDFR community is big. Really big by mod standards. Lets assume that one million copies of GTA IV were purchased on the PC for the sole purpose of playing LCPDFR (which is most certainly not going to be the case). That's a 24 to 1 ratio of people who have no interest in police work in video games vs those who do. Keep in mind that the sales figures don't take piracy into account, which further skews sales figures, as you'll note that there have been hundreds of people on this forum with jacked copies of GTA IV, and dozens of them even asked for support in making the mod work. And on top of that, the sales figures were only accurate as of 2012. It's 2013 (as if any of you haven't noticed), so I'm sure the figures have grown even more.
3.) PC gaming is not a priority for large development companies or the majority of gamers.
Consoles are only getting more popular as PC gaming begins to get more exclusive rather than inclusive due to cost, difficulty in setup and learning curve or desire for modding. Plenty of people on this forum have given up trying to get LCPDFR work their way since they just can't grasp how scripts or modding tools work. Companies that sell the majority of their titles on PS3 or XBOX with proprietary hardware and operating systems also have to convert or possibly even re-code the games for the PC with a low sales count. We'd be lucky to get a PC version at all, never mind if it's modifiable.
In closing I'd just like to say that I wish most of the things I listed here were not true, but I've spent a lot of time in computer and game sales in my last couple of jobs, I build PC's for fun and my own personal entertainment, I've taking both graphic design and programming courses giving me perspective on work loads and schedules developers have to adhere to, and of course ready plenty of news and interview with developers and company execs to gain insight on the industry and upcoming games. A few quick facts for today's gaming market (off the subject of GTA IV & V) are:
-Gaming is becoming hugely desirable for children (pre-teens and teens being the chief demographic), and are now the major market companies are making games for.
-As such, the parents normally buy the equipment and games. And most parents turned white as a sheet when I informed them that a higher end gaming PC costs about $1000 from a retail store, or maybe slightly less when built yourself.
-It's easier for parents to buy $300 consoles which last 6 years with no maintenance or upgrades required.
-PC gaming at a "professional" level is far more complicated for those not well educated in the use of a computer's hardware and software.
-Games are designed to give you freedom and choices that reality does not, and as such, companies develop the games according to what users want, or at the very least; what sells. When you think of features you'd love in a game, before you start begging for them and wondering why they don't get included in a new game, ask yourself "Would everybody want this?" Game companies prioritize the needs of the many vs. the needs of the few.