Can't get Z button to work in Super Mario Galaxy 2

[Steinfeld]

I have an emulated wiimote mapped to my keyboard and mouse. I binded "LSHIFT" to the z button on the nunchuck, but whatever I do mario won't crouch! I've only done the first star with Yoshi so far. I tried other buttons like 'F' and 'Z' but it still won't recognize it. On the configuration screen when I press LSHIFT the z button greys out, which I think means Dolphin is recognizing it.

Here are my mappings: http://imgur.com/a/LNPnF

Any idea of how to fix this?

[ExtremeDude2]

I believe it is suppose to turn read when it is working correctly, does it work if you try assigning different key?

[Steinfeld]

Wow this is really stupid but I turned down the threshold to 99 and it recognizes it now. The buttons turn red when I press them.