Yeah, you can define the maximum available invitations allowed for each group.
Fill the "Who can use Invitation Management" setting with something like "2=1" where 2 is the group id and 1 the limit.
Fill the "Who can use Invitation Management" setting with something like "2=1" where 2 is the group id and 1 the limit.
My latest plugins : Warning for PM - Lock Posts - Invitation System - Additional Usergroups - More...