With all do respect, Demon, I would never want to see full flexibility of the appearance of mIRC with a runtime compiled script. Such things become ridiculous and would probably end up a complete and ungodly mess for the simple reason that it was NOT coded for this beforehand.
Just take a look at why mIRC doesn't support unicode and probably won't. Ask the guys at Cerulean Studios about this......
I seriously doubt it's more than just a 'simple request' to do it internally. If your DLLs provide the functionality, then that's cool, but I doubt it could be done internally with 'ease'.