Done a bit of experimenting while using the trainer. Turns out if you have unlimited health (numpad 1) on during some of the boss fights they'll also have infinite health. Might want to put a warning in the text file just to let people know. It's only happened with 2 of the main story boss fights so far.
Another thing is some of the zombies will become invincible if you use the Unlimited buddy health (numpad 3) command. Luckily it isn't the normal zombies just certain harder types. This doesn't happen often.
I've tested both these and when deactivating unlimited health during the boss fight or unlimited buddy health during a fight with a strong zombie (fireman...etc) they actually take damage.
I hope this helps
Yes the unlimited health and unlimited buddy health options will make bosses have infinite health too, easy enough to grab a grenade launcher and just use the infinite ammo cheat with those two turned off to kill them fairly easily though if it could be adjusted to only affect the main character that would be even better.
The first psycho mission where this can be tested would be the old chinese man which you should get early on in the first chapter.
(After that it would be the chapter 2 biker gang boss I guess.)
EDIT: The game itself does have a few issues too such as not shutting down properly all the time so I guess Capcom might release a patch or two as well.
[Edited by LordJB, 9/5/2014 2:44:42 AM]
EDIT: Oh and other than that issue with bosses the trainer works perfectly.
[Edited by LordJB, 9/5/2014 2:45:41 AM]