Nobody? 
I like this idea. There can be a lot of chatter in league and sometimes you just want to focus in on what the leader says needs to be done. Even just making the leader chat a different colour would be helpful. This is especially true for Keyes, where everyone seems to get really excited about using their disintegration macros all at once. 
Leader of Renaissance de la Veritas
Moderator of ChampioNexus
Amygdala's Guide to the Cathedral of Pain Trial
Had an idea earlier, was wondering what others thought of it--League leader chat. Basically, it would be a special chat channel that league leaders get access to (Like the channel that opens up when you level pact someone) that will get automatically seen by everyone else in your league (and in a unique color, so it'll be hard to miss) like Dev chat, but not obnoxiously in every chat box, just the lower one. Alternatively, it could be something you could add to your chat box (to see it--not post in it), like a normal channel.
I don't see this as a needed change, but I thought it would be interesting, and I can see it helping on certain trials (so that you can follow directions/tactics/etc from the leader easier) since there can be a lot of chatter in league chat sometimes. Especially in certain non iTrial activites (like the Mothership Raid, Hamidon, Cathedral of Pain) where you may have so much going on or more than 3 teams worth of people. Sure, you can use another channel such as Request/Broadcast as a go-around, but I thought this might be a nice idea too.
What do you think?