Success. What was I testing? A modification to the system that blocks signatures from showing more than once per page in threads. It works, so this is what it means folks - your signature will only be displayed once per page. This is particularly useful with some of the larger sigs like, admittedly, mine.
Nope. Strictly speaking it isn't a "hack" because it is accomplished by modifying the display templates - no code modification necessary. In fact, it should speed the server up a hair since the transfer of duplicate signatures is cut out.