Restrict access to SQL Instances

Hi, I need to limit out contractor DBAs so that they can not see a couple of the SQL Servers in the environment.  It seems to be all or nothing with Spotlight 9.2. The ability to look at the query plans which often contain parameter values is an issue for us.

What are my options for now and is the ability to grant or restrict access to an Instance coming is a future release of Spotlight?

Thanks,

Howard