Nope. That entirely defeats the purpose. If you don't even believe including a new feature is worth a well-thought-out and dedicated, reasonable post, then it's a new feature we wouldn't want.
Though, you're free to rally and encourage someone else who you know is interested in an IM sort of application to be added to Wiichat. Rather than posting a huge post as to why you'd want it in, you could give a bit of your own reasoning why you want IMing and see if anyone else agrees with you.
Ah, you mean instantaneous notifications pop-ups. Wiichat might be compatible with such an add-on... You're free to post a thread about it in Site Feedback, you might get the Admins' attention. Just make sure you put some good effort into the post. Higher ups ain't too keen on paying attention to requests as big as this when there's no real reason behind the request, poor grammar, etc. be it Wiichat or another forum. Also, if you're ever gonna go idle while online, click Quick Links and go to "Who's online". The page refreshes itself every few minutes or so. It's certainly better than nothin'.