DABhand.. I've been mucking about with trainer options on this game as well. It's a toss up between making one (which is straight forward) and figuring out how to work that damned console
So, if you want to get together and work on it a bit, we might have better luck. I've already tackled the inventory (i'm walking around with Don Carlos in my inventory.. heh) which seems to be static in memory, like the display.
Beyond that, character XP, stats, tiredness, etc.. is what I've been playing around with. I'd like to chat at you sometime about the vehicle health and gas. I've found some quite odd bugs with the game code working on these.. such as shutting down the enemy AI.. they literally all faced north and shot full out.. nothing else.. heh.
My biggest issue is the game crashing while playing with it, then waiting a half hour to load up to try again.
Anyway, PM me and we'll see what we can do with. I'm going to go jingle with your trainer and see if it works on my PC. Would be interested to find out why it doesn't work for some =D