The best performing site we ever had (uservoice) was for StackOverflow and they just had a red text at the top of the page that said something to the effect of "Help us build the site" and linked to their uservoice forum.

We also have a lot of people connect widgets to custom anchors (super easy).

I don't know if it works the same way with GS but with UserVoice the tab is completely optional. You can link to the widget or the forum from any link/button.