Way to setup Nunchuck joystick for left and right, instead of the D-Pad only?

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What steps will reproduce the problem?
1. Run the new SDL Mame wii 1.0 with a non-TR Wiimote with Nunchuck attached
2. Run any of our standard roms, example could be Galagy, hit "home" with your 
Wiimote while in either the Mame front loader screen or after going into a Rom, 
for example Galagy. While running rom, hit Home / Input this Game / P1 Left / 
and attempt to push the Nunchuck left to be it be detected as a programmable 
movement. Wii Mame DOES NOT detect the Nunchucks movements. Unsure how to work 
around this ? Have tried hitting the Nunchucks C and Z key to try to get Sdl 
Wii Mame to detect some kind of Nunchuck movement but no dice.
3.

What is the expected output? What do you see instead?
Being able to map Nunchuck movements to Mame programmable movements.

What version of the product are you using? On what operating system?
SDL Mame 1.0 by Toadking running on Wii OS 4.1u

Please provide any additional information below.
Gamecube controller works perfectly, but we better get full-on Wiimote support 
with Nunchuck working for newer Wii's that don't have Gamecube controller 
support, for the entire community :) A joystick (Nunchuck) with a Wiimote would 
be amazing, and an easy way to enjoy Mame games on the Wii. It should be noted 
that we all owe Toadking a beer for his hardwork as this SDL Wii Mame setup, is 
freeken perfect! Zero long waits to load standard roms and solid support for 
most popular roms.

Original issue reported on code.google.com by rocketju...@gmail.com on 16 Dec 2012 at 12:14

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While trying to map the Nunchuck joystick, I was able to verify that it does 
pickup on the nunchuck buttons "C" and "Z"  as well as motion sensing in the 
Nunchuck as "Joypad5_analog_+/-.." events.

Original comment by spa...@gmail.com on 18 Mar 2013 at 8:44