Adding another command in Thread Tools
 

In the showthread.php, there is a "Thread Tools" button where you get an option to "close thread, delete thread, merge thread, etc."

I want to add another one called "Post Expired"

once that is done, I would like it to show an expired icon on the post, just like how when a thread is closed, there is an "lock" icon. Which files or templates do I need to modify? Thanks for any pointers.

Questions about modifying vBulletin's default behaviour and asking about modifications in general, should be posted in General vBulletin Questions. Please read the forum descriptions more carefully in future. I've moved your thread there for you :)

Thanks,
- Dean