When configuring my slskd server, I was looking for a feature but could not find it. After digging around in te config files and github repo I found out this feature is not implemented(yet).

Anyways, my suggestion is to add a feature to be able to set a custom message to send to leechers, just like in the desktop clients.

Would be awesome if the developers would look into it or someone who is willing to help me make a pull request!