Currently, it's not possible to link sub-tasks with a JSM request type, which means that customers won't be able to see them. By default, internal notifications sent from sub-tasks only display the sub-task issue key, title, and fields, not the parent issue key. However, if you have a custom field that contains the parent key information, it can be added to the email notifications. Just to let you know, this is a custom setup, as you can also customize your email notification templates, among other configurations, but it's a different conversation.
When a customer comments on a request type, it will only be visible on the associated issue/request type, not other child/sub-tasks or linked issues. If you want to implement this behaviour, you can set up automation to achieve it, but again, it's customization.
The JSM Data Center is highly adaptable. You can further extend its capabilities through several different marketplace apps, which are the best options for customization and extension.
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