I also have a squeaky volume rocker but it got less squeky when I forced it up by half a mm so it no longer touched the "chrome" below.
I'm also thinking of returning mine due to problems with call quality, I hear a constant buzz when making calls. I'm afraid it could be a hassle returning it though since I live in sweden, or maybe just expensive.
It's not the mic. Noise is present even when playing music, if I pause the music I can hear the noise for about 5 seconds and then it's totally quiet, you can hear something turning off.
Reverted to stock rom, no difference.