[imp] setting options in imp

[Mike Barsalou]

I have been playing around in the prefs.php file trying to change options
around...however, they don't seem to take.  For example, I would like to set
the timezone default to my timezone and remove it from the options screen.
I thought you did this by setting:

locked => true;
shared => false;

However, when that is set, it still shows up on the options screen.  Is
there something else I have to do to make this work?  Restart the http
server?  

BTW, we are using mysql to store preferences.

Mike Barsalou