Credit Multiplier and Bonus didn't seem to do anything but .... huh, perhaps you also have to enable the m_Purchased... bools, didn't test that lol. Anyways most of it is just static fields on the Global object that CE auto found for me so
It doesn't have credits but it does include a (code injection so perhaps not reliable) way to set items to 999 (though guns have to be purchased or picked up once before you can select them... couldn't find a way to bypass that with just the little amount of time I spent playing)