It appears that PREFLIST (or pup_event) is not working properly to set priority of one module over another.

Reference this thread (including solution):-

http://www.murga-linux.com/puppy/viewtopic.php?p=367201#367201

Since the Preference function should choose the preferred module, but doesn't, the above solution constitutes a good workaround for the bug I have found in the script responsible for respecting the preferences. I have posted my fixed version and details in the "Puppy 4.3.1 -- bug reports and suggestions" thread here:

http://www.murga-linux.com/puppy/viewtopic.php?p=371659#371659