For nick completer, I personally find it easier to have that dbl clk nick respond off and simply typing the first 2-4 letters in the nick, hitting TAB and then : and what I want to say. Of course, on huge channels, this isn't useful... but then, how often do you want to use it on large channels? It works fine on 100-200 person channels.

You can find me at #Invision on irc.irchighway.net or #OldGames on irc.undernet.org if you need me for anything.