Dean,

You can use SQL to hide and/or disable those tabs in the Admin menu you want to restrict.  I am pretty sure the value to set for "hidden" is as below.  If not, then it is 0.  You can do the same for DisableLink to disable one.

<code>

UPDATE Tabs
SET
IsVisible = 1
WHERE tabname = 'Tab Name You Want To Hide'
AND portalID = 'Portal Number of Your Portal Here'

</code>

If you are talking about creating restricted roles when generating new sites.

http://www.snapsis.com/DNN-Tips-And-Tricks/tabid/560/forumid/12/postid/6917/view/topic/Creating-restricted-Admin-and-Content-Roles.aspx

Hope it helps

Clay