There's a workaround to this problem, and you're halfway there by using the fusion-icon app, but it needs to be launched each time you log in.
Go to system -> Preferences -> Startup Applications / Sessions
Click add
name: fusion-icon
command: fusion-icon
Then click add again and restart X.
The only problem is that metacity will start for a brief moment when you log in, before compiz takes over, and it can look a little untidy and bouncy for a minute.
There's a workaround to this problem, and you're halfway there by using the fusion-icon app, but it needs to be launched each time you log in.
Go to system -> Preferences -> Startup Applications / Sessions
Click add
name: fusion-icon
command: fusion-icon
Then click add again and restart X.
The only problem is that metacity will start for a brief moment when you log in, before compiz takes over, and it can look a little untidy and bouncy for a minute.