Got a few things sorted

I've just somehow managed to fix the workspaces problem. I just switched workspaces on the Gnome panel and now the cube is rotating.

I installed the other Compiz-Fusion plugins (the unofficial and unsupported sets) and now I'm using the ShiftFlip plugin to perform the role that Scale used to. ShiftFlip emulates the Flip3D effect in Windows Vista Home Premium and above; or it can emulate the album cover flip effect from iTunes. I have it doing the latter. Unfortunately it requires use of the keyboard as well as the mouse, which is annoying.