Not sure how useful this might be to others, but I’m often in the situation where I’m going through several tickets with the same subject, mainly from cron mails:
I like to sort cron mails by sender or subject, but this unfortunately makes the < and > buttons in the ticket rather useless because those buttons don’t respect different sort orders. So instead I click on each ticket one at a time to open them. But this gets confusing quickly because it’s easy to lose track of which tickets are already opened, and which are not.
A way to bulk open the tickets would be very nice in this situation, e.g. by adding a special dropzone for this (preferrably the task bar, which would make this very intuitive). Then I could use shift-click to select a group of tickets, and drop them on the taskbar to open them all at once.