Prosilver location: ucp_profile_signature.html
Purpose: Add custom options in the signature posting editor
Currently the posting editor (postig_editor.html) has the event posting_editor_options_prepend to allow, as the identifier says, adding another options.
However the posting editor in signatures does not allow to add custom options through extensions.
I'm developing an extension (Markdown) which adds a custom option to disable that TextFormatter plugin for just that message and while it works on posts and private messages, it certainly does not work with signatures, as the posting editor is different, hence the need for this template event.