By default, myBB displays its post icons when creating a new topic or a new reply as radio buttons with the images of the icon displayed. The list of radio buttons can look clunky, so this plugin replaces it with a drop down list.
Download the zip file and upload the contents to your forum's main directory. Changes to themes should be made automatically, but in some cases may need to be added to the templates manually.
To do that, find in the newthread, newreply, and editpost templates:Replace it with:Code:{$posticons}Enjoy!Code:{$piconselect}
MyBB Post Icon Dropdown 1.0
Turns the post icons from radio buttons into a dropdown list.