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Work around is to collapse  the Activity tab when having more then 10 comments to add a new comment.
Please note that settings are saved when you collapse a section, when opening a new Jira issue make sure you have opened the section again.

Mentions (tagging)

Mentions (often known as @mentions) are a useful way of drawing someone's attention to a issue or a comment.
When you mention a user, they'll receive a notification by email.

You could also reassign a issue to a colleague for consultation, but that’s a fairly heavyweight operation to just ask a question.
By using @mentions, you can quickly direct conversation in comments to get needed feedback and keep you moving forward.
That way the issue always stays assigned to you and on your radar.

The following users can being mentioned in Jira:

• Reporter
• Commenter 
• Asignee
• Licensed users: YMEUACJiraServiceDeskUsers / YMEUACJiraYMEPAServicedeskUsers/YMEUACJiraUsers 

Requested participants of a ticket which are only Jira Servicedesk portal customers cannot being mentioned, unless they have left a comment in the ticket, then they will  become a commenter on the ticket.

Jira mentions dashboard filter

Following filter can being used in your dashboard to display all unresolved tickets of the last 7 days where you have being mentioned in.

• All Issues I’m mentioned in 

Workflow

A Jira Workflow has three basic components: statuses, transitions and resolutions.

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