The trouble with emoticons is the copyright, we can't just use an emoticon from anywhere as it's often difficult to determine who actually owns the intellectual rights for it. The package included with the software is, naturally, safe for use. There are a few others available for this software but, they are not as nice as what we already have......and no ninja one
If I do come across a good package that I can be sure we won't have any copyright issues with, I'll be sure to add it