Hi Kerim
You can use Broadcaster to warm/fill the cache based on most generic/common selections used by the users to provide quick access to the identical set of data to the users.
However you pre-fill cache for the queries as a whole thus as I know there is no utility to restrict the filling for particular users.
In my opinion the only way you could control this for 10 users is to update the cache for the selections used by these particular users.
But in general recommendation will be to do for all users if possible.
Regards
Ashish