I think that it might be really nice to have a system for dedicated servers in which u can see the chat logs and post comments as well.It could open up possibilities of advertising(clans) and or telling people info that they might need to know about.Swbf2 has a similar system.
Yes, it would be nice. I don't think it is possible for SWBF, however.
Sleepkiller has said that chat just goes out to all the clients and is never stored.