I was wondering if it allowed to hack/cheat in credits for when I want to speedrun as the paradox or gunslinger. Since I don't always get the stuff I want so I want to reset on them but I'm always low on credits so I'm forced to kill bosses basically just so I can do another run with gunslinger/paradox. But I was wondering if that's allowed, and if it is, can someone tell me how to best do it?

To always have hegemony credits to do speedruns that spend them, you can install (and reinstall when you run out) the speedrunning save file that's on the resources page of this leaderboard, the save file has 50k hegemony credits so it will last a long while before you'd have to reinstall it again.