Is it possible to just hack into the game files in an offline mode, and play with all the weapons & gear all u want? Good way to try those weapons that u could never get from those damn supply cases, and try those spec weaps every once in a while...so its kinda like making a copy of all the game files and hacking into them, jus somethin to play with. Dont flame plz this sounds dumb but I dont kno much about hackin.
Assuming you had the educational abilities to reverse engineer the needed code, you could simply do what every other private server has done and claim "Educational purposes only" and release the content to public, with that many people running private servers the chances of getting caught up would be slim. Of course there are additional measures that one could take to avoid getting caught, but those are better left for discussion if a server is ever made.