Made the following reply on another thread, but also found this one on my Google search, so here's the answer:
I know it's been a while since this was asked, but I've been looking for an answer myself... Finally figured it out on my own!
Pretty simple, but really stupid that we have to do this manually and that there's no option in the game for this.
Step 1: Goto your Documents folder
Step 2: Goto its subfolder called Assassin's Creed IV Black Flag
Step 3: Open Assassin4.ini (might want to make a backup copy...)
Step 4: Find all categories that are joystick-related. (by category, I mean anything like [Logitech G27 Racing Wheel USB] or [Logitech G27 Racing Wheel USB DefaultBindings])
Step 5: Change ALL non -1 entries to 0 (except VendorID and ProductID)
Step 6: Save and exit the ini
Step 7: Start AC4BF and enjoy game controller-free pillaging!
Thanks to iRacing for having editable ini files and giving me the idea to look for one with AC4BF...
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