Alright I finally got it. On ubuntu 12.10 there are a few plug-ins missing in compiz. So you have to install compiz-plugins-extra:
sudo apt-get install compiz-plugins-extra
voila the options appears. Then you can follow this guide: http://ubuntuforums.org/showthread.php?t=1968630
If you mean the "alt+tab" (I don't know how it's called), then it doesn't have a Class.
It has however a Name: Switcher.
You can find everything by using xprop:
sleep 2 && xprop -id $(xprop -root _NET_ACTIVE_WINDOW | cut -d\ -f 5)
Type this in a terminal, then press alt+tab without letting the alt key up, and you will get the results for the Switcher window.
EDIT: The following is the full output of xprop for the switcher window. Apparently it doesn't work on every situation.
_NET_WM_ICON_GEOMETRY(CARDINAL) = 7, 733, 48, 48
XKLAVIER_STATE(INTEGER) = 0, 0
WM_STATE(WM_STATE):
window state: Normal
icon window: 0x0
_NET_WM_DESKTOP(CARDINAL) = 0
_NET_FRAME_EXTENTS(CARDINAL) = 0, 0, 0, 0
_NET_WM_ALLOWED_ACTIONS(ATOM) = _NET_WM_ACTION_ABOVE, _NET_WM_ACTION_BELOW
XdndAware(ATOM) = BITMAP
WM_NAME(STRING) = "Switcher"
_NET_WM_WINDOW_TYPE(ATOM) = _NET_WM_WINDOW_TYPE_DOCK
_NET_WM_STATE(ATOM) = _NET_WM_STATE_STICKY, _NET_WM_STATE_SKIP_TASKBAR, _NET_WM_STATE_SKIP_PAGER, _NET_WM_STATE_FOCUSED
Best Answer
OK, while writing the question I found my own answer. The plugin is located in the compiz-plugins
package that can be installed with:
I don't know if this package stopped being a dependency to CCSM or something, because I don't remember having to install it before.