Currently the GTK client has a scripting interface, letting people plugin in programs (like sh script, perl scripts, whatever).
This doesn't quite work well under Windows (though I think no one really tried to fix it).
I wrote a first basic LUA engine for the client. LUA is a scripting language, designed to be embedded in programs. See http://www.lua.org for more information.
Concerns on the mailing list are that adding it will make the client have a full-featured plugin system, maybe overkill for the client, and hard to maintain.
So I'm asking who is using the current system, to help decide whether we add the LUA engine, keep or remove current system, and so on
