Memory editing seems to be the way to go for this one. Yeah it takes a bit more effort but if you play in windowed mode and you get everything set up on easy setting it works pretty well.
I managed to get all the perks except for medic up to level 6 in a few min of SP and I had infinite money, HP, and grenades going. Ammo doesn't work so well since you have to find the right mem address for every single gun. It's do able if you use a memory editor that lets you save locations but aside from that it would be tough.
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