Have you taken a look at CCSM (Compiz Config Settings Manager)? Install it from Software Center / Synaptic, or with -
Code:
sudo apt-get install compizconfig-settings-manager
..then open it from "Preferences" menu or -
press Alt-F2 > type "CCSM" > press 'Enter'
Since it has potential to break your desktop settings and window manager, it is recommended to first 'Export' its current settings ("Preferences" in CCSM > Export) so you can restore them by importing the settings file again, if required.
Although I don't know where the 'Minimize all windows' effect is hidden in it, the 'Scale' effect does allow selecting hotzones.
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