It was mentioned that a lot of people were asking for this functionality, and it's kind of appealing so I made a plugin for signatures:
Once you've got the admin box configured as you like it, go to your user profile, you'll see a new box to enter a signature. Once you've saved that, go to a page with your post on it and you get a signature. Pretty simple. Fairly customizable... only thing left is to enforce length limit done.
Really great Plugin! Is it also possible that only users with a minimum of points can use a signature? That would motivate to be more active =)
Thanks for your effort Noah.
A couple of comments:
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April 20, 2021: Q2A 1.8.6 released!