Ticket Types - Add field to allow visibility to selected User Groups

We use Ticket types and they are really useful as we can do things like adult and child ticket for the same event.
We use Event Booking also with Membership Pro. 
When someone buys a membership with us, we assign them to User Group 'Member'
For some of our events we would like to reserve some of our tickets for members. Ie Capacity =50 member tickets =10
So, on the ticket types we would like to show a 'member ticket, but only to people who are logged in as members. See screen shot.
I know this is not possible now, But I am thinking other users of EB would like this kind of feature. we certainly would