mIRC can't make types of channels for audio and visual chat, that would require the makers of clients and ircds to work together, since IRC is peer <-> server <-> peer. Besides that, it would be a MASSIVE waste of bandwidth for the servers, as they would have to relay huge amounts of information. If there was audio and visual chat, it would have to be p2p.
On another note, what do you mean by 3d graphics? There is nothing to make 3d, as IRC is all text.
FYI: There is already a script for audio chat.
