Yeah, just like Joe@ZSpeed said. You do not want to make the clutch pedal swing feel 'softer' you want to feel a bit more firm so you can gauge your initial engagement point a bit better, or make it feel like a more traditional clutch pedal.
The OE clutch in the 370z was far too soft for me.
I went with the RJM Clutch Pedal assembly:
*RJM Performance.com - Home
You can ADJUST it so it can bring it all the way down to where it engages pretty much off the floor or up to factory where it engage at the top of pedal swing. Also, it gives you that better feel.
It is highly recommended if you plan to replace your clutch in the future with with an after-market setup.
Thanks!