Hello, Nals! I've been too lazy these days
Anyway, I doubt abz61 is going to see this but, just in case, here we go:
Not all the keys of Abe's Exoddus can be configured, but the most important ones can be changed.
From the main menu screen (that one with Abe's head in the middle), go to Options -->Controls. Highlight the KEYBOARD option in the menu (using the arrow keys), and press C to configure it.
You can configure RUN, ACTION, SNEAK, THROW, JUMP and FART/ROLL.
Select a key using the arrow key and press ENTER, then press the key you want to assign to that control, and Voilá!
I hope it helps you.