I agree that the situation is a high security risk. Every malware which uses 
the monthly security hole in Firefox, Flash or similar gains user rights.  
After that it can wait until gksu is run for installing updates, packages or 
changing configuration. As soon as gksu is running it can gain root rights and 
do whatever it wants. It isn't that easy because gksu runs only menu/panel apps 
without asking but there would be an workaround if someone is really interested.
I guess the best solution would be to use Policykit for all Admin gui 
applications. So the authentication could be cached only for this app or saved 
for every start which is fine too since it prevents users from disabling the 
security feature and it should still be relatively secure too.

Notification would maybe inform the user but not prevent the root
access. Of course it would be better than the current situation.

The issue is still there in Jaunty.

-- 
gksudo should notify users that the password is being remembered and used
https://bugs.launchpad.net/bugs/18905
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