🚀 go-pugleaf

This will do what you require, but is a tad complicated. It relies on the
synergy of a number of shareware utilities working together.
Works for me.

Use After Dark. Get the shareware PowerDown 1.0 module by Dan Walkowski.
This issues a shutdown command after a user-configurable amount of time.
Install this as your screensaver, or as one of the screensavers you use
under multimodule.

Get Okey Dokey control panel 1.01, also by Dan Walkowski (and friend).
This thumps the default (outlined) button after a user-configurable
time. Used so that all documents are saved (the default) when the
shutdown command is issued.

Get Shutdown Delay 1.28, by Alessandro Levi Montalcini. This puts up
a shutdown/restart/cancel dialog for a user-configurable amount of
time before shutting down.

So with all this in place, you leave the Mac, the screensaver kicks in
and times inactivity, and eventually issues a shutdown command to all
apps. All documents are saved (the defualt button according to Apple
guidelines) and the Mac sits at the Shutdown Delay screen until you
get back, when you wake it up and press cancel.

Note - after hitting cancel, only the Finder is running, and any 
startup apps (particularly invisible appe's such as Apollo's Eagle
will be off. This doesn't affecty most people.

Cumbersome - yes. Fiddly - yes. But having your Mac power itself off
is rather neat. Anybody know something more sophisticated (using 
AppleEvents, say) to do what this guy really wants?

L.H.Wood@uk.ac.lut