Sub-tasks as an applicable issue type for Requests

Problem Definition

Currently in JIRA Service Desk it is not possible to assign any request type to sub-task therefore sub-task is not visible for customer and customer can't receive any notification when sub-task is updated.

Suggested Solution

As a JSD Agent, It would be nice to be able to tag sub-tasks with a request type so that customers will receive customer facing updates and ticket transition notifications by email when the subtasks are updated.