Now, nothing would be stopping you from modifying your forums, or hiring a 3rd party developer to make any feature you'd like, to be run on your forums.
I have thought about this. I don't personally know how to implement it, but I thought about it. Another forum on which I am a member still uses UBB.classic 6.7.3(!) and they implemented smileys and file upload with the quick reply, but the guy who did it is no longer around.
