I don't know why it was thought it was a good idea to disable the Alt key in games, while providing no option to disable the disabling of it in the EVGA Precision software. But I need use of my Alt key in games, and can't play some games without it. So, please update the EVGA Precision software or Z15 firmware so that I can choose to use the Alt key in games.
 
Outside of Alt + Tab and Alt + F4, there is no option to disable, or choose to not disable key combos that involve the Alt key. But the Alt key doesn't work in games.