A while back I read through this page on the wiki
http://wiki.esoui.com/How_to_create_custom_links
Basically I think it would be awesome if support for custom links in chat could be worked into the chat system. I've heard rumors that once upon a time they were supported, but I never really heard why they were removed.
This little addition would open up a lot of possibilities for cleanly sharing fixed data between players with the same addon without blasting the chat with unreadable garbage.
If this is never going to happen, I'd at least like to know why it's a no go since it was obviously planned for at some point.