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There are three enhancement request in this.
1. In a CM Enabled project, you should be able to compare points in the version tree, so we will investigate if there is a defect.
2. The request to add comments is a small change and can be considered for a future release.
3. ETM does not support tags today, but does support Defining custom attributes. If comments are added, we hope that will meet your need, but if not you can submit another enhancement request specific to support of Tags against points in a version tree.
Attachment (Use case)