Currently, a Review role cannot have an Application task if it is not used in another Application role in the Request. The apiCreateRequest procedure even has a comment about it.
-- Create ttRequestRoleTask Record(s) for Post, Review and Manual Post Roles
-- These Roles will only get application tasks that are also assigned to application and display roles in the Request.
There are instances where we may need to add a task that is only relevant for that Review role and not in any other Application role. I have had to make a core mod on every cApps and dspConduct implementation I've been a part of personally. I worked with Melanie Waid from support on the mod when I opened the ticket many many years ago and have been using it since.
I think this is something that should be included in dspConduct so that we can stop making this modification.
The concept of a Review Type Task within review roles allows review role the same behavior of application type tasks in application roles.