@schmanat Filtering something like “if(set(BLAH))” is currentely not supported / possible - see:
The above community post needs attention / discussion. I am sure that the dev-Team will implement it, if the community need is big enough on this. I personally would like that feature too.
For the user signature feature: To be honest, I don’t think that it is planned right now. Couldn’t find much via Google to this topic for zammad. The only thing I found is: Agent dependent Signatures · Issue #886 · zammad/zammad · GitHub
But the original poster seemed the placeholders to fit his needs.
Personally coming from osticket, I’ve learned that user defined signatures can be a pain in the ass - so this needs porper discussion and planning, too.
Anyway - just as an idea:
As workaround you could add a new user-object: vCard:
As default value I entered a space - not sure if this helps to workaround the “-” being displayed.
Anyway - you fill in the vCard-URL per Agent and add the placeholder to your signature - should be something like #{user.created_by.vcard} depending on how you named that.
Does this fit at least temporary? 