Yes, indeed, some factions aren't supposed to be in positive, namely, the villain factions.
I don't think you can side with the enemy, as the game displays, it seems like you can only grow in enmity with the evil ones.
It can still be a nice idea, what you did, except you will probably need to duplicate the code, one for the good guys, where the value will be +25000, and one for the villains, where the value oughta be -20000 (tho you're not supposed to do that on normal mode because it spawns Nemesis class enemies, and it can prolly be too hard to chew for a normal character. But, well, as all codes, you use 'em at your own risk...).
But I'm still saying it theoretically, without any idea of how it's done and if it can be done. I'm no computer guru, by all means.
Still, my thanks for your work, it's really useful, that maximum item code. Gosh was it a bummer to farm for aether crystal to create dynamite... Somehow I always ended too short on dynamite. Now I've got a 1000 stack of it, and it's all for the better. Thanks. It doesn't work on components, tho. Except for the big ones, like the still-beating heart, royal jelly or the gooey brain. And it has a strange effect when you collect potions, they go from 1 to 100 instead of stacking when you get a second one of the same kind, like those common health potion.
But that's not a concern, by all means.
I'm no hardcore player, by a long shot, and with you and your colleagues, I feel like I'm reliving the heydays of Action Replay / Game Genie / Game Shark. I don't know why people grew so hostile towards cheat codes (somewhere in between the sixth and seventh generation of game consoles). There was a time not so long ago, the devs themselves would include cheat codes in their games (mostly on PC, tho)... I guess devs fear that cheat codes would unlock paid DLC's or something... Meh. Greedy bums.
Back in my days (second / third generation console), we were happy to discover cheat codes for our games.