Ferdes, this package seems ok to me. Once installed you need to add it to menu.xml if you want the command to be at the bottom of the right-click menu. You can try to use Obmenu for this, if you are shy on editing the menu.lst (which I can perfectly understand). If once the package installed you can't get the entry as you wish in menu.xml, don't hesitate to come back in another thread, I'll try to look closer. And let me know how to get back in once the monitor is sleeping ? :p
About zram : I have tried to deactivate it just after I read Hootiegibbon's suggest. Hootie : I thought "why not try ?". But this did not work either. (very carefully, remove the file from the directory where it lives, and replace it with the original one, kept aside in case of need)
Then, I noticed something not normal with the latest upower updates, there was one machine where I got one package and another where I got 2 related packages but could not remember what.
After a closer look, the one where I got 2 : had previous depends on one, this is why I got it. I then happened to see that libupower1 has been removed from the repos and replaced by libupower-glib1.
Then I checked again because I had the 3 in one machine. And it appeared that the /usr/lib/libupower* libs did belong to 2 packages at same time ! So this is not quite correct.
I have updated and removed the obsolete package from within the Openbox distro which reboots after shutting down. The shutdown (with acpi=on) this time worked, but only this time, so back to searching.
zram is not the guilty one. I still don't know what the problem comes from but I am seeking. I have installed a Zen to be tested near, as expected it does not reboot after shutdown so as it's the smallest available around I am conparing in a "sort + diff" file, to see what I could have been missing.