* It depends on how it's done, a single /if on mIRC startup is unnoticable, having to check it every line/byte might be noticable...

* It will always give trouble, either those darn images show up in all the wrong places, or people who didn't enable smilies get confronted with (L) (U) (@) (so) etc meaning all the weirdest stuff...

* I probably wasn't clear enough about the picwin situation. If mIRC has standard support for images in chat, all channel windows will become picwins. It would be too time consuming to support, maintain and update both the normal channel windows and picwins for channels for all releases, so the 'old' one will be dumped. This means that even if you turn those images off, you're still using a picwin. This means using some higher level programming language equivalent of /drawtext for all text, plus the conversion of all displaying in mIRC (/echo).