The auto loot seems a bit buggy. I like to toggle it on and off at the end of missions, but deactivating it seems to not work. It remains active but stops working when the next mission loads, and the game ends up crashing. If I use it mid-mission and deactivate it, I can see it is still active, and I can't get it to deactivate after toggling it on/off.
Sometimes it does deactivate correctly, but seems very hit and miss.
I generally wait till I've loaded into the gamesave before activating that option and then I just leave it on all the time. Haven't run into issues with that personally.
is there anyway to improve unlimited health you can still die from falling and blowing yourself up
That might be hardcoded into the game regardless of health.