trac-code-comments-plugin
                                
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                        Allow non-admins to see the comments list
TRAC_ADMINprivileges are required to perform this operation. You don't have the required permissions.
I think that  TICKET_CREATE and/or TICKET_VIEW should be enought to see code comments list... Or even better - additional permission type: CODE_COMMENTS_LIST
This makes perfect sense and it should get in the next version (added it to the 1.2.0 milestone).
I like the custom permissions idea better and I will implement it, unless you beat me to it :-)