Well, I'm "leveled up" now (Edit: hey, look, I'm a "regular" now!
oooh-ahhh)--took a look at your thread. It looks nice; but I already had a script which does something similar--works for several sites, puts a box of smileys under or over a textarea. I don't use it much anymore; I use the Clippings extension (AMO or mozdev) instead--works everywhere, more versatile. But, thanks.
(I still think an integrated feature provided by a site is better than an external one--for smileys anyway, especially when the icons in question are themselves hosted on the site.)