[Trac] two levels of registered users

Hi all,
I'm almost a new trac user, so I apologize if this is a newbie question 
but I was not able to find an answer.

I have to setup a trac to have two different levels of registered users 
access.

To better explain what I need are "low-level" users able to create 
tickets and visualize only a subset of the tickets and "high-level" 
registered users able to create tickets and visualized/modify all of them.
My idea was to add a boolean field to the ticket, visible only by 
high-level users, used to enable/disable the "low-level" user visualization.

There is any plug-in enabling this possibility?
Can I do this in a different manner?


-Riccardo

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