AW8
Arcane
The only way I was able to start the setup menu was to open Dosbox.conf and temporarily outcomment dark.exe and add install.exe under [autoexec]. There's also the DOSBox remapper (Ctrl+F1 while in-game) but I found the DOS menu fit my needs.I have the GOG version and it took me forever to figure out how to alter the controls, but there's a config app in the start menu of all places. Don't see it anywhere else. Anyway, it has mouse sensitivity options and allows you to boot the original setup program to change keybinds. It was a pretty smooth experience after that, though I did think the game was crazy easy on medium so I'll look and see if that shield thing is on.
By the way, I didn't realize vertical aiming was vanilla behavior since I had never touched Page Up/Page Down, I thought it was a mod. I tried a program called GlovePIE to bind the mouse's vertical axis to Page Up/Page Down and...
Drunkard Simulator 95.
I'm gonna stick with horizontal aiming only, with practice shooting enemies above me using the auto-aim is starting to feel easier.