Yes! You can select the “Add Comment” rule action for all Ticket rule triggers. This action can leverage both the traditional Markdown text editor and the WYSIWYG text editor and will utilize the text editor that is currently enabled in Site Options for the product in which the rule is being defined.
You can also use ticket variables, mark comments as "Visible to Requestor," and set the ticket to a "Waiting on Requestor" status as the comment is added via Rules.
Please keep the following points in mind:
Ticket statuses can still be overwritten by rules included later in the sequence of execution or by rules actions added after the "Add Comment" action.
Using a ticket number when a ticket is created doesn't insert a ticket number.
Not all custom field types are supported - any of the "iiQ" select fields (iiQ Model, iiQ Location, iiQ User, iiQ Asset) don't return a user friendly value at the moment and aren't recommended. Also, attachment field types, links, information, and complex custom fields are also not supported.
After this Rule is saved and activated, and when a ticket is created, the Comment will be added to the Ticket and will show in the Timeline section.
On the Requestor side, the comment appears automatically on the ticket Details page/Ticket Activity section.