I found this intresting page when searching for a way to configure circular actionbars. (Not OPie as they only activate on keypress!)
Its status is:
Fixed - Developer made requested changes. QA should verify.
But I cant find any way to use circular bars in bartender 4. Is it me or did it never make it?
For all those others searching for circular action bars, also called "radial actionbars. Use macaroon, it works (as of 3.3.5) and allows arcing and circular actionbars, DOWNSIDE is that you have to configure it and its alot harder then bartender! (Yes you use it as an addition to bartender.)