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I have an idea and I would like to suggest it to you
On admin page > smilie add / edit page, there could be a new text box to apply keywords separated by comma (or like tags).
These keywords could be used on the search function of smilies picker.
So if your smile title is Wink, it comes up. If your smile code is :wink: it also comes up. So you can edit your titles and add additional codes if needed.