Thanks for clarification, but, the link goes to a page with the Duke/KingCore mod which I believe is a core mod for his mods which I understand that Arcane Scrolls is one of them and is included in the Horizons modpack. Other mods (and correct me if I'm wrong) he has listed isn't in Horizons.
duke605.x10.mx/wp
To put it bluntly "We want our chat back". I still haven't found any final solution, like stated previously, some options are either there and not working, or not there altogether in the config files. What I was hoping, since there's no way around that, if there's a chat plugin or mod where the user has complete control of what chat may or may not include.
Also, it would be an idea for a master toggle to show or hide mod updates for all mods rather than force it in chat, having mods register to this if players wish to see what needs updating. Especially and mainly focusing on made modpacks which are available on the popular modded minecraft launchers for SMP.