In 'config.ini' I was able to find the multiple DataXX lines that seem to be based on progression (Data00, Data01, etc.). I just found out about this, so I haven't gotten the time to test everything. However what I do know is the what the following lines do:

Data00 = Mercenaries Cash (Set this to whatever amount of cash you need) Data01 = Infinite Assault Rifle (0 to disable, 8 to enable) Data02 = Infinite Gattling Gun (0 to disable, 7 to enable) Data03 = Infinite Rocket Launcher (0 to disable, 6 to enable) Data04 = Infinite Ammo (0 to disable, 9 to enable) Data10 = Game Instructions (0 to have them as items, over 1 to have them as files) Data11 = Epilogue (Number is the amount of Epilogue screens available, with 8 being all of them)

I do not have a grand understanding of this game. But my guesses are it's either one of the other DataXX lines that when set at 0 sets the game as a first playthrough, or setting Data11 = 0 will make the game think it's the first playthrough. If I got the time I'll experiment with it, but if someone can beat me to it then be my guest.