Hello, I do wanna ask if it's possible to make an enemy drop a key instead of ammo with the hex editor.
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Unfortunately no. The way the original developer built the software, enemies will only ever drop ammo as they die, and only the ones who shoot projectiles. The ammo is also non-contextual, meaning that regardless of what kind of ammo you give the enemies, it will replenish your own weapon. So there's no option to make separate types of ammo.
To clarify the Hex editor options a bit more for you: it's basically like taking the front cover off of the different enemy endurance, speed, and weapon power options so you can access a few settings that are normally impossible to get from the main UI. So by using the Hex editor, you can take things to 0, -1, or above their normal values to get slightly unique results.