"Is there a way to do any geo-blocking in VIP Manager?" If not, would this be possible through VIP Intelligent Authentication or some type of integration?
Symantec VIP provides capabilities to challenge (not block) transactions originating from countries with increased risk. You can configure the countries that should fall in the increased risk category. The Below screenshot shows how you can configure that login in the VIP manager account where you want to make the changes.
Blocking authentications by IP address can be done at the VIP User Group level. You can set the levels of access for users in a group. You can also allow or deny access, or require additional authentication for specific IP addresses for users in the group.