Administrator verification for user role type Is it possible to add admin verification for specific user roles.  For instance, my site has three user roles, one of which would should get verified before gaining access to the content.  I realise there is an option " Visitors, but administrator approval is required" in the 
people > administration tab, but this would be for all users.

I'm managing roles directly through Drupal 7 and not using any modules such as profile2.

Thank in advance,

Cheers,
For the record, the option you refer to ("Visitors, but administrator approval is required") is not for all users.  It only applies to the Anonymous user role, and means that the Anonymous user is allowed to register at the site (gaining the Authenticated user role), but only after the administrator has approved the registration.

The "standard" way of doing this in Drupal is to set up the site so that the "Anonymous" user role does not get access to the content you want to reserve for verified users.

Then, to gain access the anonymous user must 1) register; and 2) the administrator must approve the registration (using the option you refer to).

How would this model work for your site?