It’s not something we are interested in building at this time.
We’d actually prefer that you switch to different discussion software rather than being forced to build this. Even if that means you are no longer a customer.
I just want to be absolutely crystal clear about our stance on this. We view signatures as harmful, like smoking, something we don’t want to ever encourage or support in any way.
That said, if you contract with a third party to build a plugin, that’s none of our business.