Regarding the Trainer 1.0/1.01, Instant Health Regen, One Hit Kills....
This trainer has a bug, as mentioned by Caliber, that some weapons in the game are not given an infinite ammo pool (I.E., you reload them and it still subtracts from your current ammo pool).
I'm right after breaking into the mainframe to add myself to the DNA encoding for the guards' assault rifles in Butcher Bay, and it seems that none of the weapons have an unlimited pool of ammo.
The trainer has NOT worked for: The Shotguns, both Normal and in the Pit (With the timed flashlight), the Pistol, and the Assault Rifle.
The never reload portion works wonderfully however.
I believe this may be happening because the weapons count the currently loaded ammo in the clip as part of the pool, as when I had no ammo for the Shotgun, hit the never reload hotkey, and the pool jumped to 99 as well as the clip.
I've so far only played the Butcher Bay portion, but it may be different for the Dark Athena portion.
If you could possibly update the trainer with a working (Or Butcher Bay compatible as the case may be) unlimited ammo option, I'd be grateful. Till then, I'll go off the ammo pool then go no reload for a while.
And if you need the saves to get there to test, I can upload them -somewhere-, though I don't know where, and I you can try various checkpoints in there.