I have written a small editor script which allows you to insert a pre-formatted comment, with the option to save and reuse a change request number as part of the comment.
After installating the xpo, the new script is avaible in the X++ editor from Script (Alt+R) \ Scripts \ Comments \ SavedComment.
The comments made with the script is formatted like this:
//[date] [current user id] #[change request number]
You can download the script from my SkyDrive:
Use of the script is entirely at your own risk.