Again something that is often asked by non technical users on IRC: changing the default decorations around nicknames for a message:
[19:09:29] <Boxxi> any messages in the chat
I really think mIRC should offer the possibility to change those.
Note that, and it's been pointed out in the past, using on text event with /halt and echoing your own message is relatively easy, however you immediately lose the ability to display consecutives spaces and it's a bit annoying to handle all the others mIRC's options just to edit those.