I've just had a look at the Settlers myself since I'm planning to add it to my two player compilation. I did some work on the executable to remove copy protection (followed the instructions on
http://aminet.net/package/game/patch/AmigaPtchListA) and made it so you can play any of the 30 levels without entering the password on keyboard.
If it's any interest, I've uploaded an ISO to the zone based on that version (basically just AmigaJay's previous release with that one executable changed). You'll still need a mouse to play though.