I found where the volume settings are stored on f/w 2.0 and higher but can't attempt to edit the files yet as I'm at work and can't access my iphone here so I'm on finder, and there is no com.celestial.plist that I can find. The directory on the iphone is /system/library/privateframeworks/celestial.framework/
I'll try grabbing these files and playing with them later as the low volume is just annoying as hell when I'm driving/in a loud environment!!
I'll keep you guys posted!
~Bryan
Edit: Noticed a user posted a similar response a few posts back but didn't give many details...plus I just like tinkering so I'll find as much as I can!