Dredging up an old thread might be counter-productive...
There's been two major updates to OS X since this thread was active 3 years ago. Is it possible that the hint described here has been superceded? (and even takes you in completely the wrong direction).

Revisiting this old post...
 

I was just going through some old notes and cruft that have collected in my home folder, and found the link to this thread.

Just wanted to mention that it appears that there was a bug in 10.4.7 that has been fixed in 10.4.8-- setting the 'require password' flag in Terminal now works. The change is immediately reflected in the GUI as well.

I cannot figure out which service to bounce to get it to take effect immediately, though-- right now the change only takes effect after the user logs out and logs back in (and presumably after a reboot as well).

Anyone have any ideas how to force the change to take effect immediately?

if so, the bug is still there ;)

i just try this based on another thread result on 10.6.4 .. same effect as described 3 years ago ;)

phillymjs: you have figured something on this ? since its a 7 Years old Thread .. it seems a unsolvabe issue :(