For each person, their signature can only appear once per page. If there is a second page though, it will appear again. Moving it to once per thread would defeat the purpose of even having a signature. If you have your settings configured like me, it will just take you to the newest response in a thread.
Support!!! I have seen people with two vids in their signature and it just clogs everything up. I do like seeing people's signatures but... videos? Share those in status updates or something and leave them out of your signatures.
