theme_addthis_toolbox() takes a config array as a parameter. Style classes can only be added by system variable though.

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#1 addthis_config_class-1264382-1.patch820 bytesjsagotsky

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new addthis_config_class-1264382-1.patch820 bytes

Attached patch checks if addthis_toolbox_item is specified in config. Uses that and then unsets it. If it doesn't exist, use the system default.