Method

To get the Mogo Mouse working under Ubuntu is now relatively straightforward. The method can be found at [1]. Essentially it consists of finding the MAC address of the mouse and connecting to it:

$ hcitool scan
Scanning ...
        AA:BB:CC:DD:EE:FF       MoGo Mouse BT
$ sudo hidd --connect=AA:BB:CC:DD:EE:FF

Prior to the scan, the "connect" button on the underside of the MoGo Mouse has to be pressed.
One has to repeat the hidd --connect step each time the computer is restarted, unfortunately.

References

[1] http://nat.truemesh.com/archives/000671.html