tl;dr: Don't use mods until someone murders the Rockstar CEO.
If you've been on /v/ or reddit for the past day or so you might have seen people complaining about being banned from GTA Online for using FOV mods, that help with motion sickness, and others. I personally think this is a retarded move from Rockstar's side. The only reason I even have the amount of hours I do in GTA IV is because of the mods for it. If you look at the community page that is actually the only thing keeping it alive this long. Ever since San Andreas mods have had a huge part in the Grand Theft Auto Series, with mods like SAMP and HD Textures. I sincerely hope someone goes allahu akbar all over the rockstar offices and runs of with the source code for the game, then leaks it online so people don't have to deal with Rockstars hate of the PC community. Not only is their game broken as shit, but they've spent over 3 years porting it to PC, and this is what we get?