Yes, you can change the style of the Feedback Widget TAB.

SoundCloud tweaked the CSS to turn the tab into a link in their top bar to integrate more seamlessly with the design of their site. They were kind enough to share their code with us:

"we simply added this bit of css code to override the look of the tab:"
a#fdbk_tab {
margin-left: 0;
position: static;
color: inherit;
background: none;
}

a#fdbk_tab:hover {
margin-left: 0;
}

So have it!