It would be nice to have a switch in admin area like this: Do you want to show images by default: YES / NO
https://forum.osticket.com/d/78279-show-images-by-default-in-thread/10
Nowadays i think most users need to see the images in a ticket by default...
I agree that this should be an option. I've added it to my list of ideas for future development.
I highly recommend just commenting out lines 447 to 468 of include/class.format.php permanently in OsTicketAwesome, this is one feature I need to change with every release to make images show by default in threads. I really can't imagine hiding inline images is something people really want in a helpdesk (often people send screenshots for support requests). The only value I can see is to stop tracking of email opens, but as its a helpdesk you would presume this shouldn't be an issue.