Rakion, made my own control file to edit some global variables, like the timescale. Only used it against enemy hackers, which were probably just leeching off some free downloads.
In boss mode, if I were the boss, I'd freeze myself (timescale too low to process movement and projectiles, but high enough to not freeze) to prevent my own death.
In other cases, I'd speed up and stunlock the hacker, or butcher the objective before they could.
Edit: I also used a gameguard bypass for blade and soul but didn't use any hacks. I was using linux at the time so it was the only way to run the game.