[K12OSN] USB drive & screen lock questions

[Phydeaux]

Hi!

We're on LTSP 5 and have the following two nagging problems:

-- USB drives seem to work for my account but not for student accounts.  Students
are all in one large group, while the administrators are in a "staff" group. I
am sure this is a permission issue, but I can't figure out where or what to look
for.  I can tell from the messages on the client machines that the drive is
recognized, but the server doesn't seem to see it unless *I* am the one logged
into the client that is mounting it.  Does anyone have a clue what to look for?
I'm sure this is simple...

-- The screen saver timeout is set to 5 minutes after which it locks the
screen.  This drives the students and teachers crazy.  Is there a way to set
this centrally?  I've tried gconf-editor but it only applied the settings to
the account I was working in.

Any advice would be appreciated,

reb