I just want something cleared up.

I've read lots of posts saying that it can, and lots saying it can't, so I wanna know if it possible to increase the accuracy/decrease spread when modding guns.

Not possible at this time.

Not possible, at this time, Like HayDizzler said, and just a bit more information. Not until we can decode the .txt files in Attributes.rez.

Yeah good luck with that, lol. I doubt that will ever get cracked.

Yeah, it's pretty much impossible. ;(