Unfortunately and due to a big lack of time, we were not able to fix this bug...
But I'm a bit lost with this one: is your problem about the position of the taskbar? With Cairo-Dock, the taskbar (the place in the dock where icons are used to monitor running applications without launcher) is always in the main dock. So if you want to move it, you have to move the main dock.
Unfortunately and due to a big lack of time, we were not able to fix this bug...
But I'm a bit lost with this one: is your problem about the position of the taskbar? With Cairo-Dock, the taskbar (the place in the dock where icons are used to monitor running applications without launcher) is always in the main dock. So if you want to move it, you have to move the main dock.