[Fyron]

There could be an extra page set up with the images for the non-standard emoticons. That way, you only see them listed if you click that link. phpBB does this if there are more than X emoticons available. The forum software automatically creates a pop up window that is accessed by clicking the "view more" link. That way, the list for the generic post page doesn't become overly cluttered, but the emoticons are still readily accessible and useable.