Thanks for the suggestions guys. It'll really help. I'm gonna be finishing some levels with the Aggressive Alien mod out of curiosity, then try the updated Insane mod, but by the end of next week I'm most certainly gonna try and fiddle with the values.
If the smell is the leash, then I'm not gonna play with that. So my work will be in the difficulty files. I literally just want to change those senses for the alien. So he can hear me and see me better, faster, farther, react to my motion and so forth. One way or another, I'm gonna make it impossible for me to peak around or over an object when the alien is looking in my direction. That's usually hilarious how long it takes for Stompy to notice, I'd like to get that to an instant reaction (as an apex predator would do), and enhance its peripheral senses so that I can't hide in corners anymore for instance when Stompy enters a room and I just lean against the door it came in, if it's not looking directly towards me, Stompy will never notice me, never, on any difficulty. Its peripheral senses really do suck.
If I can do half of the things I'd like, I'll be thrilled. If I do all of these things by some miracle, the game will be perfect for me.