Thank you for your input, everyone. I'm with argv0 here, mIRC really should display the names as the user typed them in. And it DID, in previous version. Perhaps still does, in certain cases? I haven't had the chance to test this yet, but when the server I connect to (on IRCnet) is in splitmode, mIRC shows the channel names as I like them. However, if (and this is rare, heh) the server is working "properly", it seems to use the original channel names, which are almost always in lowercase - and that I hate.

Isn't there a way to fix this? Or am I forced to just wait for the next split, and reconnect before the split ends, testing my theory...