just highlighting the actual control code characters themselves so that it's easy to see whether you're looking at [Ctrl+K], [Ctrl+B], [Ctrl+R], or [Ctrl+O] instead of the current situation where you have to copy the character and go out of the editor to a mIRC editbox to test what it is.
Now *that* would be nice.
Note that if I install the Asian language pack (code page), then the square boxes show up as "L"-shaped things that are rotated based on what control code you use. The only problem is that Ctrl-O happens to look like a space, which doesn't break a script that you already have, but does prevent you from putting Ctrl-O into a script. If that one code was changed, then it would be perfect.