Disable ticket creation for a group

It would be incredibly helpful to be able to disable end user ticket creation for a specific group, but let the same widget accept tickets for other groups.

I know we can disable ticket creation in the widget, but what if we want some groups to get tickets, but not others. For example:

1) General Help gets messages after hours

2) I'm feeling suicidal - NO ability to create a ticket, chat only. Instead give web visitor instruction on calling 911/999 or listing resources with 24/7/365 support. We don't want someone leaving a message saying they're going to cause self harm and expect us to respond.