SocioFluid is a Social Bookmarking Plugin, displaying small icons, which grows when the mouse is moved over, similar to mac effect. SocioFluid plugin
You have 2 options. 1. change yourself the plugin. 2. Let me know what do you need. The best way is to add the desired feature on openversion.com and you'll get a notification when the feature is implemented. Just follow the link in the admin pannel to request a new button.
See the previous point.