Inside your capx or project dir, locate the event sheet under the directory "Event sheets".
Edit it with notepad++ or any other tool you might use.
Search and replace <param id="0" name="Gamepad">0</param>
to
<param id="0" name="Gamepad">1</param>
or
<param id="0" name="Gamepad">2</param>
or whatever.
for easier access you can move these action to another "controls" event sheet and attach it to you main one.